diff --git a/common.lua b/common.lua
index 3ceaba9..c7547a2 100644
--- a/common.lua
+++ b/common.lua
@@ -169,6 +169,16 @@ function fs_helpers.get_inv(y)
 	return table.concat(fs, "")
 end
 
+function fs_helpers.get_prepends(size)
+	local prepend = ""
+
+	if minetest.get_modpath("i3") then
+		prepend = "no_prepend[]bgcolor[black;neither]background9[0,0;"..size..";i3_bg_full.png;false;10]style_type[button;border=false;bgimg=[combine:16x16^[noalpha^[colorize:#6b6b6b]"
+	end
+
+	return prepend
+end
+
 ---------
 -- Env --
 ---------
diff --git a/trashcan.lua b/trashcan.lua
index d9cd042..c7f25a6 100644
--- a/trashcan.lua
+++ b/trashcan.lua
@@ -20,14 +20,11 @@ minetest.register_node("pipeworks:trashcan", {
 	},
 	on_construct = function(pos)
 		local meta = minetest.get_meta(pos)
-		local prepend = ""
-		if minetest.get_modpath("i3") then
-			prepend = "no_prepend[]bgcolor[black;neither]background9[0,0;10.2,9;i3_bg_full.png;false;10]"
-		end
+		local size = "10.2,9"
 		meta:set_string("formspec",
 			"formspec_version[2]" ..
-			"size[10.2,9]"..
-			prepend ..
+			"size["..size.."]"..
+			pipeworks.fs_helpers.get_prepends(size) ..
 			"item_image[0.5,0.5;1,1;pipeworks:trashcan]"..
 			"label[1.5,1;"..S("Trash Can").."]"..
 			"list[context;trash;4.5,2;1,1;]"..
diff --git a/vacuum_tubes.lua b/vacuum_tubes.lua
index 514c628..684e6cf 100644
--- a/vacuum_tubes.lua
+++ b/vacuum_tubes.lua
@@ -39,14 +39,11 @@ if pipeworks.enable_mese_sand_tube then
 				groups = {vacuum_tube = 1},
 				on_construct = function(pos)
 					local meta = minetest.get_meta(pos)
+					local size = "6.0,2.4"
 					meta:set_int("dist", 0)
-					local prepend = ""
-					if minetest.get_modpath("i3") then
-						prepend = "no_prepend[]bgcolor[black;neither]background9[0,0;6.0,2.2;i3_bg_full.png;false;10]"
-					end
 					meta:set_string("formspec",
-						"size[6.0,2.2]"..
-						prepend ..
+						"size["..size.."]"..
+						pipeworks.fs_helpers.get_prepends(size) ..
 						"image[0.2,0;1,1;pipeworks_mese_sand_tube_inv.png]"..
 						"label[1.2,0.2;"..S("Adjustable Vacuuming Tube").."]"..
 						"field[0.5,1.6;2.1,1;dist;"..S("Radius")..";${dist}]"..