'lolman? did you test your code?'

no i did not ms. kevinz

code/game/objects/items/RCD.dm

@@ -856,6 +856,81 @@ RLD
 	desc = "It contains the design for firelock, air alarm, fire alarm, apc circuits and crap power cells."
 	upgrade = RCD_UPGRADE_SIMPLE_CIRCUITS
 
+/obj/item/construction/plumbing
+	name = "Plumbing Constructor"
+	desc = "An expertly modified RCD outfitted to construct plumbing machinery. Reload with compressed matter cartridges."
+	icon_state = "arcd"
+	item_state = "oldrcd"
+	has_ammobar = FALSE
+	matter = 200
+	max_matter = 200
+
+	///type of the plumbing machine
+	var/blueprint = null
+	///index, used in the attack self to get the type. stored here since it doesnt change
+	var/list/choices = list()
+	///index, used in the attack self to get the type. stored here since it doesnt change
+	var/list/name_to_type = list()
+	///
+	var/list/machinery_data = list("cost" = list(), "delay" = list())
+
+/obj/item/construction/plumbing/attack_self(mob/user)
+	..()
+	if(!choices.len)
+		for(var/A in subtypesof(/obj/machinery/plumbing))
+			var/obj/machinery/plumbing/M = A
+			if(initial(M.rcd_constructable))
+				choices += list(initial(M.name) = image(icon = initial(M.icon), icon_state = initial(M.icon_state)))
+				name_to_type[initial(M.name)] = M
+				machinery_data["cost"][A] = initial(M.rcd_cost)
+				machinery_data["delay"][A] = initial(M.rcd_delay)
+
+	var/choice = show_radial_menu(user, src, choices, custom_check = CALLBACK(src, .proc/check_menu, user), require_near = TRUE, tooltips = TRUE)
+	if(!check_menu(user))
+		return
+
+	blueprint = name_to_type[choice]
+	playsound(src, 'sound/effects/pop.ogg', 50, FALSE)
+	to_chat(user, "<span class='notice'>You change [name]s blueprint to '[choice]'.</span>")
+
+///pretty much rcd_create, but named differently to make myself feel less bad for copypasting from a sibling-type
+/obj/item/construction/plumbing/proc/create_machine(atom/A, mob/user)
+	if(!machinery_data || !isopenturf(A))
+		return FALSE
+
+	if(checkResource(machinery_data["cost"][blueprint], user) && blueprint)
+		if(do_after(user, machinery_data["delay"][blueprint], target = A))
+			if(checkResource(machinery_data["cost"][blueprint], user) && canPlace(A))
+				useResource(machinery_data["cost"][blueprint], user)
+				activate()
+				playsound(src.loc, 'sound/machines/click.ogg', 50, TRUE)
+				new blueprint (A, FALSE, FALSE)
+				return TRUE
+
+/obj/item/construction/plumbing/proc/canPlace(turf/T)
+	if(!isopenturf(T))
+		return FALSE
+	. = TRUE
+	for(var/obj/O in T.contents)
+		if(O.density) //let's not built ontop of dense stuff, like big machines and other obstacles, it kills my immershion
+			return FALSE
+
+/obj/item/construction/plumbing/afterattack(atom/A, mob/user, proximity)
+	. = ..()
+	if(!prox_check(proximity))
+		return
+	if(istype(A, /obj/machinery/plumbing))
+		var/obj/machinery/plumbing/P = A
+		if(P.anchored)
+			to_chat(user, "<span class='warning'>The [P.name] needs to be unanchored!</span>")
+			return
+		if(do_after(user, 20, target = P))
+			P.deconstruct() //Let's not substract matter
+			playsound(get_turf(src), 'sound/machines/click.ogg', 50, TRUE) //this is just such a great sound effect
+	else
+		create_machine(A, user)
+
+
 #undef GLOW_MODE
 #undef LIGHT_MODE
 #undef REMOVE_MODE

code/game/objects/items/RPD.dm

@@ -6,6 +6,7 @@ RPD
 #define ATMOS_CATEGORY 0
 #define DISPOSALS_CATEGORY 1
 #define TRANSIT_CATEGORY 2
+#define PLUMBING_CATEGORY 3
 
 #define BUILD_MODE (1<<0)
 #define WRENCH_MODE (1<<1)
@@ -75,6 +76,13 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 	)
 ))
 
+GLOBAL_LIST_INIT(fluid_duct_recipes, list(
+	"Fluid Ducts" = list(
+		new /datum/pipe_info/plumbing("Duct",				/obj/machinery/duct, PIPE_ONEDIR),
+		new /datum/pipe_info/plumbing/multilayer("Duct Layer-Manifold",/obj/machinery/duct/multilayered, PIPE_STRAIGHT)
+	)
+))
+
 /datum/pipe_info
 	var/name
 	var/icon_state
@@ -175,6 +183,15 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 	if(dt == PIPE_UNARY_FLIPPABLE)
 		icon_state = "[icon_state]_preview"
 
+/datum/pipe_info/plumbing/New(label, obj/path, dt=PIPE_UNARY)
+	name = label
+	id = path
+	icon_state = initial(path.icon_state)
+	dirtype = dt
+
+/datum/pipe_info/plumbing/multilayer //exists as identifier so we can see the difference between multi_layer and just ducts properly later on
+
+
 /obj/item/pipe_dispenser
 	name = "Rapid Piping Device (RPD)"
 	desc = "A device used to rapidly pipe things."
@@ -200,15 +217,19 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 	var/atmos_build_speed = 5 //deciseconds (500ms)
 	var/disposal_build_speed = 5
 	var/transit_build_speed = 5
+	var/plumbing_build_speed = 5
 	var/destroy_speed = 5
 	var/paint_speed = 5
 	var/category = ATMOS_CATEGORY
 	var/piping_layer = PIPING_LAYER_DEFAULT
+	var/ducting_layer = DUCT_LAYER_DEFAULT
 	var/datum/pipe_info/recipe
 	var/static/datum/pipe_info/first_atmos
 	var/static/datum/pipe_info/first_disposal
 	var/static/datum/pipe_info/first_transit
 	var/mode = BUILD_MODE | DESTROY_MODE | WRENCH_MODE
+	var/static/datum/pipe_info/first_plumbing
+	var/locked = FALSE //wheter we can change categories. Useful for the plumber
 
 /obj/item/pipe_dispenser/New()
 	. = ..()
@@ -256,11 +277,13 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 	var/list/data = list(
 		"category" = category,
 		"piping_layer" = piping_layer,
+		"ducting_layer" = ducting_layer,
 		"preview_rows" = recipe.get_preview(p_dir),
 		"categories" = list(),
 		"selected_color" = paint_color,
 		"paint_colors" = GLOB.pipe_paint_colors,
 		"mode" = mode
+		"locked" = locked
 	)
 
 	var/list/recipes
@@ -271,6 +294,8 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 			recipes = GLOB.disposal_pipe_recipes
 		if(TRANSIT_CATEGORY)
 			recipes = GLOB.transit_tube_recipes
+		if(PLUMBING_CATEGORY)
+			recipes = GLOB.fluid_duct_recipes
 	for(var/c in recipes)
 		var/list/cat = recipes[c]
 		var/list/r = list()
@@ -299,6 +324,8 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 					recipe = first_atmos
 				if(TRANSIT_CATEGORY)
 					recipe = first_transit
+				if(PLUMBING_CATEGORY)
+					recipe = first_plumbing
 			p_dir = NORTH
 			playeffect = FALSE
 		if("piping_layer")
@@ -469,16 +496,56 @@ GLOBAL_LIST_INIT(transit_tube_recipes, list(
 						if(mode & WRENCH_MODE)
 							tube.wrench_act(user, src)
 					return
-
+			if(PLUMBING_CATEGORY) //Plumbing.
+				if(!can_make_pipe)
+					return ..()
+				A = get_turf(A)
+				if(isclosedturf(A))
+					to_chat(user, "<span class='warning'>[src]'s error light flickers; there's something in the way!</span>")
+					return
+				to_chat(user, "<span class='notice'>You start building a fluid duct...</span>")
+				playsound(get_turf(src), 'sound/machines/click.ogg', 50, 1)
+				if(do_after(user, plumbing_build_speed, target = A))
+					var/obj/machinery/duct/D
+					if(recipe.type == /datum/pipe_info/plumbing/multilayer)
+						var/temp_connects = NORTH + SOUTH
+						if(queued_p_dir == EAST)
+							temp_connects = EAST + WEST
+						D = new queued_p_type (A, TRUE, GLOB.pipe_paint_colors[paint_color], ducting_layer, temp_connects)
+					else
+						D = new queued_p_type (A, TRUE, GLOB.pipe_paint_colors[paint_color], ducting_layer)
+					D.add_fingerprint(usr)
+					if(mode & WRENCH_MODE)
+						D.wrench_act(user, src)
 			else
 				return ..()
 
 /obj/item/pipe_dispenser/proc/activate()
 	playsound(get_turf(src), 'sound/items/deconstruct.ogg', 50, 1)
 
+/obj/item/pipe_dispenser/plumbing
+	name = "Plumberinator"
+	desc = "A crude device to rapidly plumb things."
+	icon_state = "plumberer"
+	category = PLUMBING_CATEGORY
+	locked = TRUE
+
+/obj/item/pipe_dispenser/plumbing/Initialize()
+	. = ..()
+	spark_system = new
+	spark_system.set_up(5, 0, src)
+	spark_system.attach(src)
+	if(!first_plumbing)
+		first_plumbing = GLOB.fluid_duct_recipes[GLOB.fluid_duct_recipes[1]][1]
+
+	recipe = first_plumbing
+
+
+
 #undef ATMOS_CATEGORY
 #undef DISPOSALS_CATEGORY
 #undef TRANSIT_CATEGORY
+#undef PLUMBING_CATEGORY
 
 #undef BUILD_MODE
 #undef DESTROY_MODE

code/game/objects/items/stacks/sheets/sheet_types.dm

@@ -773,6 +773,7 @@ GLOBAL_LIST_INIT(plastic_recipes, list(
 	new /datum/stack_recipe("water bottle", /obj/item/reagent_containers/glass/beaker/waterbottle/empty), \
 	new /datum/stack_recipe("large water bottle", /obj/item/reagent_containers/glass/beaker/waterbottle/large/empty,3), \
 	new /datum/stack_recipe("shower curtain", /obj/structure/curtain, 10, time = 10, one_per_turf = 1, on_floor = 1), \
+	new /datum/stack_recipe("duct", /obj/item/stack/ducts,1), \
 	new /datum/stack_recipe("laser pointer case", /obj/item/glasswork/glass_base/laserpointer_shell, 30), \
 	new /datum/stack_recipe("wet floor sign", /obj/item/caution, 2)))
 

code/game/objects/objs.dm

@@ -324,3 +324,6 @@
 	. = ..()
 	if(. && ricochet_damage_mod)
 		take_damage(P.damage * ricochet_damage_mod, P.damage_type, P.flag, 0, turn(P.dir, 180), P.armour_penetration) // pass along ricochet_damage_mod damage to the structure for the ricochet
+
+/obj/proc/plunger_act(obj/item/plunger/P, mob/living/user, reinforced)
+	return

code/game/objects/structures/geyser.dm

@@ -0,0 +1,74 @@
+//If you look at the "geyser_soup" overlay icon_state, you'll see that the first frame has 25 ticks.
+//That's because the first 18~ ticks are completely skipped for some ungodly weird fucking byond reason
+
+/obj/structure/geyser
+	name = "geyser"
+	icon = 'icons/obj/lavaland/terrain.dmi'
+	icon_state = "geyser"
+	anchored = TRUE
+	var/decay = 0 //reagents/tick removed
+	var/erupting_state = null //set to null to get it greyscaled from "[icon_state]_soup". Not very usable with the whole random thing, but more types can be added if you change the spawn prob
+	var/activated = FALSE //whether we are active and generating chems
+	var/reagent_id = "oil"
+	var/potency = 2 //how much reagents we add every process (2 seconds)
+	var/max_volume = 500
+	var/start_volume = 50
+
+/obj/structure/geyser/proc/start_chemming()
+	activated = TRUE
+	create_reagents(max_volume, DRAINABLE)
+	reagents.add_reagent(reagent_id, start_volume)
+	START_PROCESSING(SSfluids, src) //It's main function is to be plumbed, so use SSfluids
+	if(erupting_state)
+		icon_state = erupting_state
+	else
+		var/mutable_appearance/I = mutable_appearance('icons/obj/lavaland/terrain.dmi', "[icon_state]_soup")
+		I.color = mix_color_from_reagents(reagents.reagent_list)
+		add_overlay(I)
+
+/obj/structure/geyser/process()
+	if(activated && reagents.total_volume <= reagents.maximum_volume) //this is also evaluated in add_reagent, but from my understanding proc calls are expensive and should be avoided in continous
+		reagents.add_reagent(reagent_id, potency)						   //processes
+		if(potency > 0)
+			potency =- decay //decaying!
+
+/obj/structure/geyser/plunger_act(obj/item/plunger/P, mob/living/user, _reinforced)
+	if(!_reinforced)
+		to_chat(user, "<span class='warning'>The [P.name] isn't strong enough!</span>")
+		return
+	if(activated)
+		to_chat(user, "<span class'warning'>The [name] is already active!")
+		return
+
+	to_chat(user, "<span class='notice'>You start vigorously plunging [src]!")
+	if(do_after(user, 50*P.plunge_mod, target = src) && !activated)
+		start_chemming()
+
+/obj/structure/geyser/random
+	erupting_state = null
+	var/list/options = list("oil" = 2, "clf3" = 1) //formerly crudeoil, 2,1
+/obj/structure/geyser/random/Initialize()
+	. = ..()
+	reagent_id = pickweight(options)
+
+/obj/item/plunger
+	name = "plunger"
+	desc = "It's a plunger for plunging."
+	icon = 'icons/obj/watercloset.dmi'
+	icon_state = "plunger"
+	slot_flags = ITEM_SLOT_MASK
+
+	var/plunge_mod = 1 //time*plunge_mod = total time we take to plunge an object
+	var/reinforced = FALSE //whether we do heavy duty stuff like geysers
+
+/obj/item/plunger/attack_obj(obj/O, mob/living/user)
+	if(!O.plunger_act(src, user, reinforced))
+		return ..()
+
+/obj/item/plunger/reinforced
+	name = "reinforced plunger"
+	desc = " It's an M. 7 Reinforced Plunger for heavy duty plunging."
+	icon_state = "reinforced_plunger"
+
+	reinforced = TRUE
+	plunge_mod = 0.8