diff --git a/basis/recipe_lib.lua b/basis/recipe_lib.lua
index 4d98ee7..e583c71 100644
--- a/basis/recipe_lib.lua
+++ b/basis/recipe_lib.lua
@@ -169,6 +169,14 @@ function techage.recipes.get_recipe(name)
 	return NormalizedRecipes[name]
 end
 
+function techage.recipes.set_recipe(pos, rtype, idx)
+	local nvm = techage.get_nvm(pos)
+	if not nvm.running then
+		local recipes = Recipes[rtype] or {}
+		idx = tonumber(idx) or 1
+		nvm.recipe_idx = range(idx, 1, #recipes)
+	end
+end
 
 function techage.recipes.get_default_group_item_name(item_name)
 	if item_name and item_name:sub(1, 6) == "group:" then
diff --git a/chemistry/ta4_doser.lua b/chemistry/ta4_doser.lua
index 316a3c6..ca99fb9 100644
--- a/chemistry/ta4_doser.lua
+++ b/chemistry/ta4_doser.lua
@@ -358,7 +358,12 @@ liquid.register_nodes({"techage:ta4_doser", "techage:ta4_doser_on"}, Pipe, "pump
 
 techage.register_node({"techage:ta4_doser", "techage:ta4_doser_on"}, {
 	on_recv_message = function(pos, src, topic, payload)
-		return State:on_receive_message(pos, topic, payload)
+		if topic == "recipe" then
+			techage.recipes.set_recipe(pos, "ta4_doser", payload)
+			return true
+		else
+			return State:on_receive_message(pos, topic, payload)
+		end
 	end,
 	on_beduino_receive_cmnd = function(pos, src, topic, payload)
 		return State:on_beduino_receive_cmnd(pos, topic, payload)
diff --git a/chemistry/ta4_reactor.lua b/chemistry/ta4_reactor.lua
index 2736091..6b2108d 100644
--- a/chemistry/ta4_reactor.lua
+++ b/chemistry/ta4_reactor.lua
@@ -168,6 +168,28 @@ minetest.register_node("techage:ta4_reactor", {
 	sounds = default.node_sound_metal_defaults(),
 })
 
+techage.register_node({"techage:ta4_reactor"}, {
+	on_inv_request = function(pos, in_dir, access_type)
+		local meta = minetest.get_meta(pos)
+		return meta:get_inventory(), "main"
+	end,
+	on_pull_item = function(pos, in_dir, num, item_name)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.get_items(pos, inv, "main", num)
+	end,
+	on_push_item = function(pos, in_dir, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "main", stack)
+	end,
+	on_unpull_item = function(pos, in_dir, stack)
+		local meta = minetest.get_meta(pos)
+		local inv = meta:get_inventory()
+		return techage.put_items(inv, "main", stack)
+	end,
+})
+
 minetest.register_craft({
 	output = 'techage:ta4_reactor',
 	recipe = {
diff --git a/iron_age/hopper.lua b/iron_age/hopper.lua
index c70ac3e..745b301 100644
--- a/iron_age/hopper.lua
+++ b/iron_age/hopper.lua
@@ -22,7 +22,7 @@ minetest.register_alias("techage:hopper_ta1", "minecart:hopper")
 minecart.register_inventory(
 	{
 		"techage:chest_ta2", "techage:chest_ta3", "techage:chest_ta4",
-		"techage:meltingpot", "techage:meltingpot_active",
+		"techage:meltingpot", "techage:meltingpot_active", "techage:ta4_reactor",
 	},
 	{
 		put = {