There's a bounty for this right? i spent nearly two full days at this

code/modules/plumbing/ducts.dm

@@ -407,10 +407,10 @@ All the important duct code:
 	. += "<span class='notice'>It's current color and layer are [duct_color] and [duct_layer]. Use in-hand to change.</span>"
 
 /obj/item/stack/ducts/attack_self(mob/user)
-	var/new_layer = input("Select a layer", "Layer") as null|anything in layers
+	var/new_layer = tgui_input_list(user, "Select a layer", "Layer", layers)
 	if(new_layer)
 		duct_layer = new_layer
-	var/new_color = input("Select a color", "Color") as null|anything in GLOB.pipe_paint_colors
+	var/new_color = tgui_input_list(user, "Select a color", "Color", GLOB.pipe_paint_colors)
 	if(new_color)
 		duct_color = new_color
 		add_atom_colour(GLOB.pipe_paint_colors[new_color], FIXED_COLOUR_PRIORITY)

code/modules/plumbing/plumbers/bottler.dm

@@ -51,7 +51,7 @@
 ///changing input ammount with a window
 /obj/machinery/plumbing/bottler/interact(mob/user)
 	. = ..()
-	wanted_amount = clamp(round(input(user,"maximum is 100u","set ammount to fill with") as num|null, 1), 1, 100)
+	wanted_amount = clamp(round(tgui_input_num(user,"maximum is 100u","set ammount to fill with"), 1), 1, 100)
 	reagents.clear_reagents()
 	to_chat(user, "<span class='notice'> The [src] will now fill for [wanted_amount]u.</span>")