diff --git a/code/game/machinery/pandemic.dm b/code/game/machinery/pandemic.dm
index 2d588892be..7b37a5d729 100644
--- a/code/game/machinery/pandemic.dm
+++ b/code/game/machinery/pandemic.dm
@@ -16,7 +16,7 @@
 
 // PanDEMIC Vial
 /obj/item/reagent_containers/glass/beaker/vial/vaccine
-	possible_transfer_amounts = (list(5, 10, 15))
+	max_transfer_amount = 15
 	volume = 15
 
 /obj/item/reagent_containers/glass/beaker/vial/vaccine/Initialize(mapload)
diff --git a/code/game/objects/items/contraband.dm b/code/game/objects/items/contraband.dm
index 6958ca2af5..22dfb0a925 100644
--- a/code/game/objects/items/contraband.dm
+++ b/code/game/objects/items/contraband.dm
@@ -52,7 +52,8 @@
 	icon_state = "powder"
 	item_state = "powder"
 	amount_per_transfer_from_this = 2
-	possible_transfer_amounts = 2
+	max_transfer_amount = 2
+	min_transfer_amount = 1
 	w_class = ITEMSIZE_TINY
 	volume = 50
 
diff --git a/code/game/objects/items/weapons/ecigs.dm b/code/game/objects/items/weapons/ecigs.dm
index e8342a69a2..3fff2e6ef5 100644
--- a/code/game/objects/items/weapons/ecigs.dm
+++ b/code/game/objects/items/weapons/ecigs.dm
@@ -153,7 +153,7 @@
 	matter = list(MAT_STEEL = 50, MAT_GLASS = 10)
 	volume = 20
 	flags = OPENCONTAINER
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 
 /obj/item/reagent_containers/ecig_cartridge/examine(mob/user as mob)//to see how much left
 	. = ..()
diff --git a/code/game/objects/items/weapons/paint.dm b/code/game/objects/items/weapons/paint.dm
index 3685e5d05e..25dab1b593 100644
--- a/code/game/objects/items/weapons/paint.dm
+++ b/code/game/objects/items/weapons/paint.dm
@@ -10,7 +10,7 @@
 	matter = list(MAT_STEEL = 200)
 	w_class = ITEMSIZE_NORMAL
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(10,20,30,60)
+	max_transfer_amount = 60
 	volume = 60
 	unacidable = FALSE
 	flags = OPENCONTAINER
diff --git a/code/modules/detectivework/tools/luminol.dm b/code/modules/detectivework/tools/luminol.dm
index 2c9dbf0607..fbb0d8298a 100644
--- a/code/modules/detectivework/tools/luminol.dm
+++ b/code/modules/detectivework/tools/luminol.dm
@@ -5,7 +5,7 @@
 	icon_state = "luminol"
 	item_state = "cleaner"
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(5,10)
+	max_transfer_amount = 10
 	volume = 250
 
 /obj/item/reagent_containers/spray/luminol/Initialize(mapload)
diff --git a/code/modules/detectivework/tools/rag.dm b/code/modules/detectivework/tools/rag.dm
index b565fcc4fe..2de7bdedb1 100644
--- a/code/modules/detectivework/tools/rag.dm
+++ b/code/modules/detectivework/tools/rag.dm
@@ -18,7 +18,7 @@
 	icon = 'icons/obj/toy.dmi'
 	icon_state = "rag"
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = list(5)
+	max_transfer_amount = 5
 	volume = 10
 	can_be_placed_into = null
 	flags = OPENCONTAINER | NOBLUDGEON
diff --git a/code/modules/food/drinkingglass/drinkingglass.dm b/code/modules/food/drinkingglass/drinkingglass.dm
index dde1dfd8ea..1b51e48846 100644
--- a/code/modules/food/drinkingglass/drinkingglass.dm
+++ b/code/modules/food/drinkingglass/drinkingglass.dm
@@ -22,7 +22,7 @@
 	center_of_mass_y = 10
 
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = list(5,10,15,30)
+	max_transfer_amount = 30
 	flags = OPENCONTAINER
 
 	matter = list(MAT_GLASS = 60)
diff --git a/code/modules/food/drinkingglass/glass_types.dm b/code/modules/food/drinkingglass/glass_types.dm
index 2002d2c50e..9d238ed1a4 100644
--- a/code/modules/food/drinkingglass/glass_types.dm
+++ b/code/modules/food/drinkingglass/glass_types.dm
@@ -6,7 +6,7 @@
 	desc = "Your standard drinking glass."
 	filling_states = list(20, 40, 60, 80, 100)
 	volume = 30
-	possible_transfer_amounts = list(5,10,15,30)
+	max_transfer_amount = 30
 	rim_pos = list(23,13,20) // y, x0, x1
 	matter = list(MAT_GLASS = 60)
 
@@ -17,7 +17,7 @@
 	icon_state = "rocks"
 	filling_states = list(25, 50, 75, 100)
 	volume = 20
-	possible_transfer_amounts = list(5,10,20)
+	max_transfer_amount = 20
 	rim_pos = list(21, 10, 23)
 	matter = list(MAT_GLASS = 40)
 
@@ -28,7 +28,7 @@
 	icon_state = "shake"
 	filling_states = list(25, 50, 75, 100)
 	volume = 30
-	possible_transfer_amounts = list(5,10,15,30)
+	max_transfer_amount = 30
 	rim_pos = list(25, 13, 21)
 	matter = list(MAT_GLASS = 30)
 
@@ -39,7 +39,7 @@
 	icon_state = "cocktail"
 	filling_states = list(33, 66, 100)
 	volume = 15
-	possible_transfer_amounts = list(5,10,15)
+	max_transfer_amount = 15
 	rim_pos = list(22, 13, 21)
 	matter = list(MAT_GLASS = 30)
 
@@ -50,7 +50,7 @@
 	icon_state = "shot"
 	filling_states = list(33, 66, 100)
 	volume = 5
-	possible_transfer_amounts = list(1,2,5)
+	max_transfer_amount = 5
 	rim_pos = list(17, 13, 21)
 	matter = list(MAT_GLASS = 10)
 
@@ -61,7 +61,7 @@
 	icon_state = "pint"
 	filling_states = list(16, 33, 50, 66, 83, 100)
 	volume = 60
-	possible_transfer_amounts = list(5,10,15,30,60)
+	max_transfer_amount = 60
 	rim_pos = list(25, 12, 21)
 	matter = list(MAT_GLASS = 120)
 
@@ -72,7 +72,7 @@
 	icon_state = "mug"
 	filling_states = list(25, 50, 75, 100)
 	volume = 40
-	possible_transfer_amounts = list(5,10,20,40)
+	max_transfer_amount = 40
 	rim_pos = list(22, 12, 20)
 	matter = list(MAT_GLASS = 80)
 
@@ -83,6 +83,6 @@
 	icon_state = "wine"
 	filling_states = list(20, 40, 60, 80, 100)
 	volume = 25
-	possible_transfer_amounts = list(5, 10, 15, 25)
+	max_transfer_amount = 25
 	rim_pos = list(25, 12, 21)
 	matter = list(MAT_GLASS = 50)
diff --git a/code/modules/food/drinkingglass/serving_glasses.dm b/code/modules/food/drinkingglass/serving_glasses.dm
index b43ba17a5c..5ecb22d582 100644
--- a/code/modules/food/drinkingglass/serving_glasses.dm
+++ b/code/modules/food/drinkingglass/serving_glasses.dm
@@ -5,7 +5,7 @@
 	icon = 'icons/obj/drinks.dmi'
 	filling_states = list(10, 20, 30, 40, 50, 60, 70, 80, 90, 100)
 	volume = 120
-	possible_transfer_amounts = list(5,15,30)
+	max_transfer_amount = 60
 	matter = list(MAT_GLASS = 50)
 
 /obj/item/reagent_containers/food/drinks/glass2/pitcher
@@ -15,5 +15,5 @@
 	icon = 'icons/obj/drinks.dmi'
 	filling_states = list(15, 30, 50, 70, 85, 100)
 	volume = 120
-	possible_transfer_amounts = list(5,15,30)
+	max_transfer_amount = 60
 	matter = list(MAT_PLASTIC = 50)
diff --git a/code/modules/food/drinkingglass/shaker.dm b/code/modules/food/drinkingglass/shaker.dm
index 0ea6be86a2..8a7c7e612d 100644
--- a/code/modules/food/drinkingglass/shaker.dm
+++ b/code/modules/food/drinkingglass/shaker.dm
@@ -7,7 +7,7 @@
 	volume = 100
 	matter = list(MAT_PLASTIC = 2000)
 	filling_states = list(10,20,30,40,50,60,70,80)
-	possible_transfer_amounts = list(5, 10, 15, 25)
+	max_transfer_amount = 50
 	rim_pos = null // no fruit slices
 	var/lid_color = "black"
 
diff --git a/code/modules/food/food.dm b/code/modules/food/food.dm
index f6cfc20471..645da3969a 100644
--- a/code/modules/food/food.dm
+++ b/code/modules/food/food.dm
@@ -5,7 +5,7 @@
 /// Food.
 ////////////////////////////////////////////////////////////////////////////////
 /obj/item/reagent_containers/food
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	volume = 50 //Sets the default container amount for all food items.
 	description_info = "Food can use the Rename Food verb in the Object Tab to rename it."
 	var/filling_color = "#FFFFFF" //Used by sandwiches and custom food.
diff --git a/code/modules/food/food/condiment.dm b/code/modules/food/food/condiment.dm
index d18650cd96..fca908e44f 100644
--- a/code/modules/food/food/condiment.dm
+++ b/code/modules/food/food/condiment.dm
@@ -11,7 +11,7 @@
 	icon = 'icons/obj/food.dmi'
 	icon_state = "emptycondiment"
 	flags = OPENCONTAINER
-	possible_transfer_amounts = list(1,5,10)
+	max_transfer_amount = 10
 	center_of_mass_x = 16
 	center_of_mass_y = 6
 	volume = 50
@@ -241,7 +241,8 @@
 	reagents.add_reagent(REAGENT_ID_SPRINKLES, 50)
 
 /obj/item/reagent_containers/food/condiment/small
-	possible_transfer_amounts = list(1,20)
+	max_transfer_amount = 20
+	min_transfer_amount = 1
 	amount_per_transfer_from_this = 1
 	volume = 20
 	center_of_mass_x = 0
@@ -297,7 +298,8 @@
 /obj/item/reagent_containers/food/condiment/small/packet
 	icon_state = "packet_small"
 	w_class = ITEMSIZE_TINY
-	possible_transfer_amounts = "1;5;10"
+	max_transfer_amount = 5
+	min_transfer_amount = 1
 	amount_per_transfer_from_this = 1
 	volume = 5
 
@@ -542,7 +544,7 @@
 	name = "space spices"
 	desc = "An exotic blend of spices for cooking. Definitely not worms."
 	icon_state = "spacespicebottle"
-	possible_transfer_amounts = list(1,40) //for clown turning the lid off
+	max_transfer_amount = 40
 	amount_per_transfer_from_this = 1
 	volume = 40
 
diff --git a/code/modules/food/food/drinks.dm b/code/modules/food/food/drinks.dm
index 7b6d43509b..f30dd3ff29 100644
--- a/code/modules/food/food/drinks.dm
+++ b/code/modules/food/food/drinks.dm
@@ -10,7 +10,7 @@
 	icon_state = null
 	flags = OPENCONTAINER
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = list(5,10,15,25,30)
+	max_transfer_amount = 50
 	volume = 50
 	var/trash = null
 	var/cant_open = 0
@@ -228,7 +228,7 @@
 	force = 14
 	throwforce = 10
 	amount_per_transfer_from_this = 20
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	volume = 150
 	flags = OPENCONTAINER
 
@@ -442,7 +442,7 @@
 	name = "paper cup"
 	desc = "A paper water cup."
 	icon_state = "water_cup_e"
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	volume = 10
 	center_of_mass_x = 16
 	center_of_mass_y = 12
diff --git a/code/modules/food/glass/bottle.dm b/code/modules/food/glass/bottle.dm
index 191243c08e..0a5c4cefda 100644
--- a/code/modules/food/glass/bottle.dm
+++ b/code/modules/food/glass/bottle.dm
@@ -8,7 +8,7 @@
 	icon_state = null
 	item_state = "atoxinbottle"
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(5,10,15,25,30,60)
+	max_transfer_amount = 60
 	flags = 0
 	volume = 60
 	drop_sound = 'sound/items/drop/bottle.ogg'
diff --git a/code/modules/food/glass/bottle/robot.dm b/code/modules/food/glass/bottle/robot.dm
index d047976c9b..1111dcd428 100644
--- a/code/modules/food/glass/bottle/robot.dm
+++ b/code/modules/food/glass/bottle/robot.dm
@@ -1,7 +1,7 @@
 
 /obj/item/reagent_containers/glass/bottle/robot
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(5,10,15,25,30,50,100)
+	max_transfer_amount = 60
 	flags = OPENCONTAINER
 	volume = 60
 	var/reagent = ""
diff --git a/code/modules/hydroponics/backtank.dm b/code/modules/hydroponics/backtank.dm
index ec61882a90..6dfcae437a 100644
--- a/code/modules/hydroponics/backtank.dm
+++ b/code/modules/hydroponics/backtank.dm
@@ -136,7 +136,7 @@
 	item_state = "mister"
 	w_class = ITEMSIZE_LARGE
 	amount_per_transfer_from_this = 50
-	possible_transfer_amounts = list(50)
+	max_transfer_amount = null
 	volume = 500
 	item_flags = NOBLUDGEON
 	slot_flags = NONE
@@ -187,7 +187,7 @@
 	icon_state = "misterjani"
 	item_state = "misterjani"
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = list(5,10)
+	max_transfer_amount = 10
 	spray_size = 4
 
 /*
@@ -216,7 +216,7 @@
 	icon_state = "mistersec"
 	item_state = "mistersec"
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = list(5,10)
+	max_transfer_amount = 10
 	spray_size = 6
 
 /*
@@ -252,7 +252,7 @@
 	w_class = ITEMSIZE_HUGE
 	volume = 2000
 	amount_per_transfer_from_this = 100
-	possible_transfer_amounts = list(75,100,150)
+	max_transfer_amount = 150
 
 /*
  * Atmos tank
@@ -282,7 +282,7 @@
 	w_class = ITEMSIZE_HUGE
 	volume = 200
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = list(5,10)
+	max_transfer_amount = 10
 	spray_size = null
 
 /obj/item/reagent_containers/spray/mister/atmos/Spray_at(atom/A as mob|obj)
diff --git a/code/modules/mob/living/silicon/robot/subtypes/boozeborg.dm b/code/modules/mob/living/silicon/robot/subtypes/boozeborg.dm
index cfb0b0ca5f..53ea364334 100644
--- a/code/modules/mob/living/silicon/robot/subtypes/boozeborg.dm
+++ b/code/modules/mob/living/silicon/robot/subtypes/boozeborg.dm
@@ -129,7 +129,7 @@ What Borgs are available is sadly handled in the above file in the proc
 	charge_cost = 20
 	recharge_time = 3
 	volume = 120
-	possible_transfer_amounts = list(1 ,5, 10, 20, 30)
+	max_transfer_amount = 60
 
 //Resking proc for boozos
 
diff --git a/code/modules/reagents/machinery/dispenser/cartridge.dm b/code/modules/reagents/machinery/dispenser/cartridge.dm
index e78bcab747..d9e30df8e4 100644
--- a/code/modules/reagents/machinery/dispenser/cartridge.dm
+++ b/code/modules/reagents/machinery/dispenser/cartridge.dm
@@ -7,8 +7,9 @@
 
 	volume = CARTRIDGE_VOLUME_LARGE
 	amount_per_transfer_from_this = 50
-	// Large, but inaccurate. Use a chem dispenser or beaker for accuracy.
-	possible_transfer_amounts = list(50, 100, 250, 500)
+	// Large, but inaccurate. Use a chem dispenser or beaker for small volumes.
+	max_transfer_amount = 500
+	min_transfer_amount = 50
 	unacidable = TRUE
 
 	var/spawn_reagent = null
diff --git a/code/modules/reagents/reagent_containers/_reagent_containers.dm b/code/modules/reagents/reagent_containers/_reagent_containers.dm
index a9a0cadac5..5ad63dd8b0 100644
--- a/code/modules/reagents/reagent_containers/_reagent_containers.dm
+++ b/code/modules/reagents/reagent_containers/_reagent_containers.dm
@@ -5,7 +5,8 @@
 	icon_state = null
 	w_class = ITEMSIZE_SMALL
 	var/amount_per_transfer_from_this = 5
-	var/possible_transfer_amounts = list(5,10,15,25,30)
+	var/max_transfer_amount = 30
+	var/min_transfer_amount = 5
 	var/volume = 30
 	var/list/starts_with
 
@@ -13,13 +14,13 @@
 	set name = "Set transfer amount"
 	set category = "Object"
 	set src in range(0)
-	var/N = tgui_input_list(usr, "Amount per transfer from this:","[src]", possible_transfer_amounts)
+	var/N = tgui_input_number(usr, "Amount per transfer from this: ([min_transfer_amount]-[max_transfer_amount])","[src]",amount_per_transfer_from_this,max_transfer_amount,min_transfer_amount)
 	if(N)
 		amount_per_transfer_from_this = N
 
 /obj/item/reagent_containers/Initialize(mapload)
 	. = ..()
-	if(!possible_transfer_amounts)
+	if(!max_transfer_amount)
 		src.verbs -= /obj/item/reagent_containers/verb/set_APTFT
 	create_reagents(volume)
 
@@ -171,3 +172,13 @@
 		if(B)
 			balloon_alert(user, "\The [W] burns the blood in \the [src].")
 			B.changling_blood_test(reagents)
+
+/obj/item/reagent_containers/AltClick(mob/user)
+	. = ..()
+	if(!Adjacent(user))
+		return
+	if(!max_transfer_amount)
+		return
+	var/N = tgui_input_number(user, "Amount per transfer from this: ([min_transfer_amount]-[max_transfer_amount])","[src]",amount_per_transfer_from_this,max_transfer_amount,min_transfer_amount)
+	if(N)
+		amount_per_transfer_from_this = N
diff --git a/code/modules/reagents/reagent_containers/bluespacecoffee.dm b/code/modules/reagents/reagent_containers/bluespacecoffee.dm
index 0e9033daaa..23ad9b323d 100644
--- a/code/modules/reagents/reagent_containers/bluespacecoffee.dm
+++ b/code/modules/reagents/reagent_containers/bluespacecoffee.dm
@@ -6,6 +6,7 @@
 	center_of_mass_x = 15
 	center_of_mass_y = 10
 	volume = 50
+	max_transfer_amount = 50
 
 /obj/item/reagent_containers/food/drinks/bluespace_coffee/Initialize(mapload)
 	. = ..()
diff --git a/code/modules/reagents/reagent_containers/borghypo.dm b/code/modules/reagents/reagent_containers/borghypo.dm
index 657430d5a8..83689ee3c8 100644
--- a/code/modules/reagents/reagent_containers/borghypo.dm
+++ b/code/modules/reagents/reagent_containers/borghypo.dm
@@ -6,7 +6,7 @@
 	icon_state = "borghypo"
 	amount_per_transfer_from_this = 5
 	volume = 30
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 
 	var/mode = 1
 	var/charge_cost = 325
@@ -134,7 +134,7 @@
 	charge_cost = 20
 	recharge_time = 3
 	volume = 60
-	possible_transfer_amounts = list(5, 10, 20, 30)
+	max_transfer_amount = 30
 	reagent_ids = list(REAGENT_ID_ALE,
 		REAGENT_ID_APPLEJUICE, //CHOMPADD it has literally every other type of juice..
 		REAGENT_ID_BEER,
diff --git a/code/modules/reagents/reagent_containers/dropper.dm b/code/modules/reagents/reagent_containers/dropper.dm
index 08bd8f312b..506dec3660 100644
--- a/code/modules/reagents/reagent_containers/dropper.dm
+++ b/code/modules/reagents/reagent_containers/dropper.dm
@@ -7,7 +7,8 @@
 	icon = 'icons/obj/chemical.dmi'
 	icon_state = "dropper0"
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = list(1,2,3,4,5)
+	max_transfer_amount = 5
+	min_transfer_amount = 1
 	w_class = ITEMSIZE_TINY
 	slot_flags = SLOT_EARS
 	volume = 5
@@ -106,7 +107,8 @@
 	name = "Industrial Dropper"
 	desc = "A larger dropper. Transfers up to 10 units at a time."
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(1,2,3,4,5,6,7,8,9,10)
+	max_transfer_amount = 10
+	min_transfer_amount = 1
 	volume = 10
 
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/code/modules/reagents/reagent_containers/glass.dm b/code/modules/reagents/reagent_containers/glass.dm
index de16605539..83e91a7789 100644
--- a/code/modules/reagents/reagent_containers/glass.dm
+++ b/code/modules/reagents/reagent_containers/glass.dm
@@ -11,7 +11,7 @@
 	icon_state = "null"
 	item_state = "null"
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(5,10,15,25,30,60)
+	max_transfer_amount = 60
 	volume = 60
 	w_class = ITEMSIZE_SMALL
 	flags = OPENCONTAINER | NOCONDUCT
@@ -249,7 +249,7 @@
 	matter = list(MAT_GLASS = 5000)
 	volume = 120
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(5,10,15,25,30,60,120)
+	max_transfer_amount = 120
 	flags = OPENCONTAINER
 	rating = 3
 
@@ -273,7 +273,7 @@
 	matter = list(MAT_GLASS = 5000)
 	volume = 300
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(5,10,15,25,30,60,120,300)
+	max_transfer_amount = 300
 	flags = OPENCONTAINER
 	rating = 5
 
@@ -287,7 +287,7 @@
 	volume = 30
 	w_class = ITEMSIZE_TINY
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(5,10,15,30)
+	max_transfer_amount = 30
 	flags = OPENCONTAINER
 
 /obj/item/reagent_containers/glass/beaker/cryoxadone
@@ -305,7 +305,7 @@
 	center_of_mass_y = 13
 	volume = 120
 	amount_per_transfer_from_this = 10
-	possible_transfer_amounts = list(5,10,15,25,30,60,120)
+	max_transfer_amount = 120
 	flags = OPENCONTAINER
 
 /obj/item/reagent_containers/glass/bucket
@@ -319,7 +319,7 @@
 	matter = list(MAT_STEEL = 200)
 	w_class = ITEMSIZE_NORMAL
 	amount_per_transfer_from_this = 20
-	possible_transfer_amounts = list(10,20,30,60,120)
+	max_transfer_amount = 120
 	volume = 120
 	flags = OPENCONTAINER
 	unacidable = FALSE
@@ -378,7 +378,7 @@
 	matter = list(MAT_WOOD = 50)
 	w_class = ITEMSIZE_LARGE
 	amount_per_transfer_from_this = 20
-	possible_transfer_amounts = list(10,20,30,60,120)
+	max_transfer_amount = 120
 	volume = 120
 	flags = OPENCONTAINER
 	unacidable = FALSE
@@ -414,7 +414,7 @@
 	matter = list(MAT_PLASTIC = 2000)
 	w_class = ITEMSIZE_NO_CONTAINER
 	amount_per_transfer_from_this = 20
-	possible_transfer_amounts = list(10,20,30,60,120)
+	max_transfer_amount = 120
 	volume = 2000
 	slowdown = 2
 
diff --git a/code/modules/reagents/reagent_containers/hypospray.dm b/code/modules/reagents/reagent_containers/hypospray.dm
index 39a007675b..18c9e0c2dd 100644
--- a/code/modules/reagents/reagent_containers/hypospray.dm
+++ b/code/modules/reagents/reagent_containers/hypospray.dm
@@ -11,7 +11,7 @@
 	amount_per_transfer_from_this = 5
 	unacidable = TRUE
 	volume = 30
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	flags = OPENCONTAINER
 	slot_flags = SLOT_BELT
 	drop_sound = 'sound/items/drop/gun.ogg'
diff --git a/code/modules/reagents/reagent_containers/patch.dm b/code/modules/reagents/reagent_containers/patch.dm
index 647a3c48be..09ef619e82 100644
--- a/code/modules/reagents/reagent_containers/patch.dm
+++ b/code/modules/reagents/reagent_containers/patch.dm
@@ -12,7 +12,7 @@
 
 	base_state = "patch"
 
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	w_class = ITEMSIZE_TINY
 	slot_flags = SLOT_EARS
 	volume = 60
diff --git a/code/modules/reagents/reagent_containers/pill.dm b/code/modules/reagents/reagent_containers/pill.dm
index f4767b0e15..82c9a29a4e 100644
--- a/code/modules/reagents/reagent_containers/pill.dm
+++ b/code/modules/reagents/reagent_containers/pill.dm
@@ -12,7 +12,7 @@
 
 	var/base_state = "pill"
 
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	w_class = ITEMSIZE_TINY
 	slot_flags = SLOT_EARS
 	volume = 60
diff --git a/code/modules/reagents/reagent_containers/spray.dm b/code/modules/reagents/reagent_containers/spray.dm
index ff970c3f53..19b61877fa 100644
--- a/code/modules/reagents/reagent_containers/spray.dm
+++ b/code/modules/reagents/reagent_containers/spray.dm
@@ -15,7 +15,7 @@
 	throw_range = 10
 	amount_per_transfer_from_this = 10
 	unacidable = TRUE //plastic
-	possible_transfer_amounts = list(5,10) //Set to null instead of list, if there is only one.
+	max_transfer_amount = 10 //Set to null instead of list, if there is only one.
 	var/spray_size = 3
 	var/list/spray_sizes = list(1,3)
 	volume = 250
@@ -71,12 +71,14 @@
 			D.set_up(my_target, spray_size, 10)
 	return
 
-/obj/item/reagent_containers/spray/attack_self(var/mob/user)
-	if(!possible_transfer_amounts)
+/*
+/obj/item/reagent_containers/spray/attack_self(var/mob/user) //Now done via alt-click instead
+	if(!max_transfer_amount)
 		return
 	amount_per_transfer_from_this = next_in_list(amount_per_transfer_from_this, possible_transfer_amounts)
 	spray_size = next_in_list(spray_size, spray_sizes)
 	balloon_alert(user, "pressure nozzle adjusted to [amount_per_transfer_from_this] units per spray.")
+*/
 
 /obj/item/reagent_containers/spray/examine(mob/user)
 	. = ..()
@@ -125,7 +127,7 @@
 	item_state = "pepperspray"
 	center_of_mass_x = 16
 	center_of_mass_y = 16
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	volume = 40
 	var/safety = TRUE
 
@@ -155,7 +157,7 @@
 	icon_state = "sunflower"
 	item_state = "sunflower"
 	amount_per_transfer_from_this = 1
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	volume = 10
 	drop_sound = 'sound/items/drop/herb.ogg'
 	pickup_sound = 'sound/items/pickup/herb.ogg'
@@ -175,7 +177,7 @@
 	center_of_mass_y = 16
 	throwforce = 3
 	w_class = ITEMSIZE_NORMAL
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	volume = 600
 	origin_tech = list(TECH_COMBAT = 3, TECH_MATERIAL = 3, TECH_ENGINEERING = 3)
 
@@ -221,7 +223,7 @@
 	center_of_mass_x = 16
 	center_of_mass_y = 10
 
-	possible_transfer_amounts = list(5,10,20)
+	max_transfer_amount = 20
 
 	var/heavy_spray = FALSE
 	var/spray_particles = 3
diff --git a/code/modules/reagents/reagent_containers/spray_vr.dm b/code/modules/reagents/reagent_containers/spray_vr.dm
index bdd298ee6f..9de7848694 100644
--- a/code/modules/reagents/reagent_containers/spray_vr.dm
+++ b/code/modules/reagents/reagent_containers/spray_vr.dm
@@ -4,7 +4,7 @@
 	icon = 'icons/obj/items.dmi'
 	icon_state = "windowsealant"
 	item_state = "spraycan"
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	volume = 80
 
 /obj/item/reagent_containers/spray/windowsealant/Initialize(mapload)
diff --git a/code/modules/reagents/reagent_containers/syringes.dm b/code/modules/reagents/reagent_containers/syringes.dm
index c358f964dc..e9466749b1 100644
--- a/code/modules/reagents/reagent_containers/syringes.dm
+++ b/code/modules/reagents/reagent_containers/syringes.dm
@@ -20,7 +20,7 @@
 	center_of_mass_y = 14
 	matter = list(MAT_GLASS = 150)
 	amount_per_transfer_from_this = 5
-	possible_transfer_amounts = null
+	max_transfer_amount = null
 	volume = 15
 	w_class = ITEMSIZE_TINY
 	slot_flags = SLOT_EARS
diff --git a/code/modules/refinery/equipment/chemcontainer.dm b/code/modules/refinery/equipment/chemcontainer.dm
index 04ed0d3d54..27e8045a47 100644
--- a/code/modules/refinery/equipment/chemcontainer.dm
+++ b/code/modules/refinery/equipment/chemcontainer.dm
@@ -14,7 +14,7 @@
 
 	volume = CARTRIDGE_VOLUME_LARGE
 	amount_per_transfer_from_this = CARTRIDGE_VOLUME_LARGE
-	possible_transfer_amounts = list(CARTRIDGE_VOLUME_LARGE)
+	max_transfer_amount = null //Can be null as there was only one value set previously anyway
 	unacidable = TRUE
 
 	VAR_PROTECTED/loaded_reagent = null