diff --git a/compat-chests.lua b/compat-chests.lua
index ef771ab..c018f75 100644
--- a/compat-chests.lua
+++ b/compat-chests.lua
@@ -6,6 +6,8 @@
 
 local fs_helpers = pipeworks.fs_helpers
 
+tube_entry = "^pipeworks_tube_connection_wooden.png"
+
 local base_chest_formspec = "size[8,9]" ..
 	default.gui_bg ..
 	default.gui_bg_img ..
@@ -34,11 +36,11 @@ end
 
 minetest.override_item("default:chest", {
 	tiles = {
-		"default_chest_top.png^pipeworks_tube_connection_wooden.png",
-		"default_chest_top.png^pipeworks_tube_connection_wooden.png",
-		"default_chest_side.png^pipeworks_tube_connection_wooden.png",
-		"default_chest_side.png^pipeworks_tube_connection_wooden.png",
-		"default_chest_side.png^pipeworks_tube_connection_wooden.png",
+		"default_chest_top.png"..tube_entry,
+		"default_chest_top.png"..tube_entry,
+		"default_chest_side.png"..tube_entry,
+		"default_chest_side.png"..tube_entry,
+		"default_chest_side.png"..tube_entry,
 		"default_chest_front.png"
 	},
 	groups = {choppy = 2, oddly_breakable_by_hand = 2, tubedevice = 1, tubedevice_receiver = 1},
@@ -101,11 +103,11 @@ end
 
 minetest.override_item("default:chest_locked", {
 	tiles = {
-		"default_chest_top.png^pipeworks_tube_connection_wooden.png",
-		"default_chest_top.png^pipeworks_tube_connection_wooden.png",
-		"default_chest_side.png^pipeworks_tube_connection_wooden.png",
-		"default_chest_side.png^pipeworks_tube_connection_wooden.png",
-		"default_chest_side.png^pipeworks_tube_connection_wooden.png",
+		"default_chest_top.png"..tube_entry,
+		"default_chest_top.png"..tube_entry,
+		"default_chest_side.png"..tube_entry,
+		"default_chest_side.png"..tube_entry,
+		"default_chest_side.png"..tube_entry,
 		"default_chest_lock.png"
 	},
 	groups = {choppy = 2, oddly_breakable_by_hand = 2, tubedevice = 1, tubedevice_receiver = 1},
diff --git a/compat-furnaces.lua b/compat-furnaces.lua
index ae63e3a..c2c5df4 100644
--- a/compat-furnaces.lua
+++ b/compat-furnaces.lua
@@ -4,6 +4,8 @@
 
 local fs_helpers = pipeworks.fs_helpers
 
+tube_entry = "^pipeworks_tube_connection_stony.png"
+
 local function active_formspec(fuel_percent, item_percent, pos, meta)
 	local formspec =
 		"size[8,8.5]"..
@@ -271,11 +273,11 @@ end
 minetest.register_node(":default:furnace", {
 	description = "Furnace",
 	tiles = {
-		"default_furnace_top.png^pipeworks_tube_connection_stony.png",
-		"default_furnace_bottom.png^pipeworks_tube_connection_stony.png",
-		"default_furnace_side.png^pipeworks_tube_connection_stony.png",
-		"default_furnace_side.png^pipeworks_tube_connection_stony.png",
-		"default_furnace_side.png^pipeworks_tube_connection_stony.png",
+		"default_furnace_top.png"..tube_entry,
+		"default_furnace_bottom.png"..tube_entry,
+		"default_furnace_side.png"..tube_entry,
+		"default_furnace_side.png"..tube_entry,
+		"default_furnace_side.png"..tube_entry,
 		"default_furnace_front.png"
 	},
 	groups = {cracky = 2, tubedevice = 1, tubedevice_receiver = 1},
@@ -359,11 +361,11 @@ minetest.register_node(":default:furnace", {
 minetest.register_node(":default:furnace_active", {
 	description = "Furnace",
 	tiles = {
-		"default_furnace_top.png^pipeworks_tube_connection_stony.png",
-		"default_furnace_bottom.png^pipeworks_tube_connection_stony.png",
-		"default_furnace_side.png^pipeworks_tube_connection_stony.png",
-		"default_furnace_side.png^pipeworks_tube_connection_stony.png",
-		"default_furnace_side.png^pipeworks_tube_connection_stony.png",
+		"default_furnace_top.png"..tube_entry,
+		"default_furnace_bottom.png"..tube_entry,
+		"default_furnace_side.png"..tube_entry,
+		"default_furnace_side.png"..tube_entry,
+		"default_furnace_side.png"..tube_entry,
 		{
 			image = "default_furnace_front_active.png",
 			backface_culling = false,