diff --git a/doc/manual_DE.lua b/doc/manual_DE.lua
index 016c02f..181aa19 100644
--- a/doc/manual_DE.lua
+++ b/doc/manual_DE.lua
@@ -1340,7 +1340,16 @@ techage.manual_DE.aText = {
   "\n"..
   "\n"..
   "\n",
-  "Die TA4 Sensor Kiste dient zum Aufbau von Automatischen Lagern oder Verkaufsautomaten. Sie hat erweitere Kommandos zur Fernsteuerung.\n"..
+  "Die TA4 Sensor Kiste dient zum Aufbau von Automatischen Lagern oder Verkaufsautomaten in Verbindung mit dem Lua Controller.\n"..
+  "Wird etwas in die Kiste gelegt\\, oder entnommen\\, oder eine der Tasten \"F1\"/\"F2\" gedrückt\\, so wird ein Event-Signal an den Lua Controller gesendet.\n"..
+  "Die Sensor Kiste unterstützt folgende Kommandos:\n"..
+  "\n"..
+  "  - Über 'state = $read_data(<num>\\, \"state\")' kann der Status der Kiste abgefragt werden. Mögliche Antworten sind: \"empty\"\\, \"loaded\"\\, \"full\"\n"..
+  "  - Über 'name\\, action = $read_data(<num>\\, \"action\")' kann die letzte Spieleraktion abgefragt werden. 'name' ist der Spielername\\, Als 'action' wird zurückgeliefert: \"put\"\\, \"take\"\\, \"f1\"\\, \"f2\".\n"..
+  "  - Über 'stacks = $read_data(<num>\\, \"stacks\")' kann der Inhalt der Kiste ausgelesen werden. Siehe dazu: https://github.com/joe7575/techage/blob/master/manuals/ta4_lua_controller_EN.md#sensor-chest\n"..
+  "  - Über '$send_cmnd(<num>\\, \"text\"\\, \"press both buttons andnput something into the chest\")' kann der Text im Menü der Sensor Kiste gesetzt werden.\n"..
+  "\n"..
+  "Über die Checkbox \"Erlaube öffentlichen Zugriff\" kann eingestellt werden\\, ob die Kiste von jedem genutzt werden darf\\, oder nur vom Spielern die hier Zugriffsrechte haben.\n"..
   "\n"..
   "\n"..
   "\n",
diff --git a/doc/manual_EN.lua b/doc/manual_EN.lua
index 81533c6..3473f67 100644
--- a/doc/manual_EN.lua
+++ b/doc/manual_EN.lua
@@ -1331,7 +1331,16 @@ techage.manual_EN.aText = {
   "\n"..
   "\n"..
   "\n",
-  "The TA4 sensor box is used to set up automatic warehouses or vending machines. It has additional commands for remote control.\n"..
+  "The TA4 sensor box is used to set up automatic warehouses or vending machines in conjunction with the Lua controller.\n"..
+  "If something is put into the box or removed\\, or one of the \"F1\" / \"F2\" keys is pressed\\, an event signal is sent to the Lua controller.\n"..
+  "The sensor box supports the following commands:\n"..
+  "\n"..
+  "  - The status of the box can be queried via 'state = $read_data(<num>\\, \"state\")'. Possible answers are: \"empty\"\\, \"loaded\"\\, \"full\"\n"..
+  "  - The last player action can be queried via 'name\\, action = $read_data(<num>\\, \"action\")'. 'name' is the player name. One of the following is returned as 'action': \"put\"\\, \"take\"\\, \"f1\"\\, \"f2\".\n"..
+  "  - The contents of the box can be read out via 'stacks = $read_data(<num>\\, \"stacks\")'. See: https://github.com/joe7575/techage/blob/master/manuals/ta4_lua_controller_EN.md#sensor-chest\n"..
+  "  - Via '$send_cmnd(<num>\\, \"text\"\\, \"press both buttons andnput something into the chest\")' the text can be set in the menu of the sensor box.\n"..
+  "\n"..
+  "The checkbox \"Allow public chest access\" can be used to set whether the box can be used by everyone or only by players who have access/protection rights here.\n"..
   "\n"..
   "\n"..
   "\n",
@@ -1417,8 +1426,8 @@ techage.manual_EN.aText = {
   "\n"..
   "The TA4 pusher has two additional commands for the Lua controller:\n"..
   "\n"..
-  "  - 'config' is used to configure the pusher\\, analogous to manual configuration via the menu.\nExample: '$ send_cmnd(1234\\, \"config\"\\, \"default: dirt\")'\n"..
-  "  - 'pull' is used to send an order to the pusher:\nExample: '$ send_cmnd(1234\\, \"pull\"\\, \"default: dirt 8\")'\nValues ​​from 1 to 12 are permitted as numbers. Then the pusher goes back to 'stopped' mode and sends an\" off \"command back to the transmitter of the\" pull \"command.\n"..
+  "  - 'config' is used to configure the pusher\\, analogous to manual configuration via the menu.\nExample: '$send_cmnd(1234\\, \"config\"\\, \"default: dirt\")'\n"..
+  "  - 'pull' is used to send an order to the pusher:\nExample: '$send_cmnd(1234\\, \"pull\"\\, \"default: dirt 8\")'\nValues ​​from 1 to 12 are permitted as numbers. Then the pusher goes back to 'stopped' mode and sends an\" off \"command back to the transmitter of the\" pull \"command.\n"..
   "\n"..
   "\n"..
   "\n",
@@ -1449,7 +1458,7 @@ techage.manual_EN.aText = {
   "\n"..
   "The chest has an additional command for the Lua controller:\n"..
   "\n"..
-  "  - 'count' is used to request how many items are in the chest.\nExample 1: '$ read_data(CHEST\\, \"count\")' -> Sum of items across all 8 stores\nExample 2: '$ read_data(CHEST\\, \"count\"\\, 2)' -> number of items in store 2 (second from left)\n"..
+  "  - 'count' is used to request how many items are in the chest.\nExample 1: '$read_data(CHEST\\, \"count\")' -> Sum of items across all 8 stores\nExample 2: '$read_data(CHEST\\, \"count\"\\, 2)' -> number of items in store 2 (second from left)\n"..
   "\n"..
   "\n"..
   "\n",
diff --git a/items/hydrogen.lua b/items/hydrogen.lua
index c64c4a6..160d61a 100644
--- a/items/hydrogen.lua
+++ b/items/hydrogen.lua
@@ -17,6 +17,7 @@ local S = techage.S
 minetest.register_craftitem("techage:hydrogen", {
 	description = S("TA4 Hydrogen"),
 	inventory_image = "techage_hydrogen_inv.png",
+	groups = {ta_liquid = 1},	
 })
 
 minetest.register_craftitem("techage:cylinder_small_hydrogen", {
diff --git a/items/lye.lua b/items/lye.lua
index 50f2922..ec401ca 100644
--- a/items/lye.lua
+++ b/items/lye.lua
@@ -17,6 +17,7 @@ local S = techage.S
 minetest.register_craftitem("techage:lye", {
 	description = S("Lye"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#7fd44c:120^techage_liquid1_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:barrel_lye", {
diff --git a/items/oil.lua b/items/oil.lua
index a36ff1a..1db905f 100644
--- a/items/oil.lua
+++ b/items/oil.lua
@@ -58,7 +58,7 @@ minetest.register_node("techage:oil_source", {
     liquid_range = 10,
 	liquid_renewable = false,
 	post_effect_color = {a = 200, r = 1, g = 1, b = 1},
-	groups = {liquid = 5},
+	groups = {liquid = 5, ta_liquid = 1},
 })
 
 minetest.register_node("techage:oil_flowing", {
diff --git a/items/petroleum.lua b/items/petroleum.lua
index 463bd78..2cb38a4 100644
--- a/items/petroleum.lua
+++ b/items/petroleum.lua
@@ -18,26 +18,31 @@ local S = techage.S
 minetest.register_craftitem("techage:bitumen", {
 	description = S("TA3 Bitumen"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#000000",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:fueloil", {
 	description = S("TA3 Fuel Oil"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#7E5D0A:180^techage_liquid1_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:naphtha", {
 	description = S("TA3 Naphtha"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#AAA820:180^techage_liquid1_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:gasoline", {
 	description = S("TA3 Gasoline"),
 	inventory_image = "techage_liquid2_inv.png^[colorize:#EEFC52:180^techage_liquid1_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:gas", {
 	description = S("TA3 Propane"),
 	inventory_image = "techage_gas_inv.png",
+	groups = {ta_liquid = 1},
 })
 
 minetest.register_craftitem("techage:ta3_cylinder_small_gas", {
diff --git a/liquids/silo.lua b/liquids/silo.lua
index 7087050..fd0cd73 100644
--- a/liquids/silo.lua
+++ b/liquids/silo.lua
@@ -26,9 +26,10 @@ local function allow_metadata_inventory_put(pos, listname, index, stack, player)
 	if minetest.is_protected(pos, player:get_player_name()) then
 		return 0
 	end
-	-- check if it is powder
-	local ndef = minetest.registered_craftitems[stack:get_name()] or {}
-	if ndef.groups and ndef.groups.powder == 1 then
+	-- check if it is powder or techage liquid item (migration function)
+	local ndef = minetest.registered_craftitems[stack:get_name()] or 
+			minetest.registered_items[stack:get_name()] or {}
+	if ndef.groups and (ndef.groups.powder == 1 or ndef.groups.ta_liquid == 1) then
 		local nvm = techage.get_nvm(pos)
 		nvm.item_name = nil
 		local inv = minetest.get_meta(pos):get_inventory()
diff --git a/locale/techage.de.tr b/locale/techage.de.tr
index fce382b..4079a00 100644
--- a/locale/techage.de.tr
+++ b/locale/techage.de.tr
@@ -1,10 +1,11 @@
 # textdomain: techage
 
- ku is needed!)= ku wird benötigt!)
+ ku is needed!)=
 #### TA3 Terminal ####@n@nSend commands to your machines@nand output text messages from your@nmachines to the Terminal.@n@nCommand syntax:@n  cmd <num> <cmnd>@n@nexample: cmd 181 on@n<num> is the number of the node to which the command is sent@n'on' is the command to turn machines/nodes on@nFurther commands can be retrieved by clicking on@nmachines/nodes with the Techage Info Tool.@n@nLocal commands:@n- clear    @= clear screen@n- help     @= this message@n- pub      @= switch to public use@n- priv      @= switch to private use@nTo program a user button with a command:@n  set <button-num> <button-text> <command>@ne.g. 'set 1 ON cmd 123 on'@n=
 Accu Box=Akkublock
 Active:=Aktiv:
 All nodes:=Alle Blöcke:
+Allow public chest access=Erlaube öffentlichen Zugriff
 Allow to dig/place Techage power lines nearby power poles=Erlaubt TODO
 Aluminum=Aluminium
 Area already loaded or max. number of Forceload Blocks reached!=Bereich bereits geladen oder maximale Anzahl von Forceload Blöcken erreicht!
@@ -453,3 +454,4 @@ water temperature=Wassertemperatur
 wrong catalyst=falscher Katalysator
 wrong storage diameter=Falscher Wärmespeicher-Durchmesser
 ##### not used anymore #####
+ku is needed!)= ku wird benötigt!)
\ No newline at end of file
diff --git a/locale/template.txt b/locale/template.txt
index a6aeb79..cdcdce3 100644
--- a/locale/template.txt
+++ b/locale/template.txt
@@ -3,6 +3,7 @@
 Accu Box=
 Active:=
 All nodes:=
+Allow public chest access=
 Allow to dig/place Techage power lines nearby power poles=
 Aluminum=
 Area already loaded or max. number of Forceload Blocks reached!=
diff --git a/lua_controller/sensorchest.lua b/lua_controller/sensorchest.lua
index aa04ddc..2a0858b 100644
--- a/lua_controller/sensorchest.lua
+++ b/lua_controller/sensorchest.lua
@@ -63,7 +63,7 @@ local function get_stacks(pos)
 end
 
 local function allow_metadata_inventory_put(pos, listname, index, stack, player)
-	if minetest.is_protected(pos, player:get_player_name()) then
+	if M(pos):get_string("public") ~= "true" and minetest.is_protected(pos, player:get_player_name()) then
 		return 0
 	end
 	store_action(pos, player, "put")
@@ -72,7 +72,7 @@ local function allow_metadata_inventory_put(pos, listname, index, stack, player)
 end
 
 local function allow_metadata_inventory_take(pos, listname, index, stack, player)
-	if minetest.is_protected(pos, player:get_player_name()) then
+	if M(pos):get_string("public") ~= "true" and minetest.is_protected(pos, player:get_player_name()) then
 		return 0
 	end
 	store_action(pos, player, "take")
@@ -93,12 +93,13 @@ local function after_dig_node(pos, oldnode, oldmetadata, digger)
 end
 
 local function formspec1()
-	return "size[6,4]"..
+	return "size[5.5,4]"..
 	default.gui_bg..
 	default.gui_bg_img..
 	default.gui_slots..
 	"field[0.5,1;5,1;number;TA4 Lua Controller number:;]" ..
-	"button_exit[1.5,2.5;2,1;exit;Save]"
+	"checkbox[0.5,1.8;public;"..S("Allow public chest access")..";false]"..
+	"button_exit[1.7,2.8;2,1;exit;Save]"
 end
 
 local function formspec2(pos)
@@ -147,7 +148,15 @@ minetest.register_node("techage:ta4_sensor_chest", {
 	on_receive_fields = function(pos, formname, fields, player)
 		local meta = M(pos)
 		local nvm = techage.get_nvm(pos)
-		if fields.number and fields.number ~= "" then
+		
+		if meta:get_string("public") ~= "true" and minetest.is_protected(pos, player:get_player_name()) then
+			return 0
+		end
+		
+		if fields.public then
+			meta:set_string("public", fields.public)
+		end
+		if fields.quit == "true" and fields.number and fields.number ~= "" then
 			local owner = meta:get_string("owner")
 			if techage.check_numbers(fields.number, owner) then
 				meta:set_string("number", fields.number)
diff --git a/manuals/manual_ta4_DE.md b/manuals/manual_ta4_DE.md
index 4807bbc..178c703 100644
--- a/manuals/manual_ta4_DE.md
+++ b/manuals/manual_ta4_DE.md
@@ -386,7 +386,17 @@ Der Server dient zur zentralen Speicherung von Daten von mehreren Lua Controller
 
 ### TA4 Sensor Kiste/Chest
 
-Die TA4 Sensor Kiste dient zum Aufbau von Automatischen Lagern oder Verkaufsautomaten. Sie hat erweitere Kommandos zur Fernsteuerung.
+Die TA4 Sensor Kiste dient zum Aufbau von Automatischen Lagern oder Verkaufsautomaten in Verbindung mit dem Lua Controller.
+Wird etwas in die Kiste gelegt, oder entnommen, oder eine der Tasten "F1"/"F2" gedrückt, so wird ein Event-Signal an den Lua Controller gesendet.
+Die Sensor Kiste unterstützt folgende Kommandos:
+
+- Über `state = $read_data(<num>, "state")` kann der Status der Kiste abgefragt werden. Mögliche Antworten sind: "empty", "loaded", "full"
+- Über `name, action = $read_data(<num>, "action")` kann die letzte Spieleraktion abgefragt werden. `name` ist der Spielername, Als `action` wird zurückgeliefert: "put", "take", "f1", "f2".
+- Über `stacks = $read_data(<num>, "stacks")` kann der Inhalt der Kiste ausgelesen werden. Siehe dazu: https://github.com/joe7575/techage/blob/master/manuals/ta4_lua_controller_EN.md#sensor-chest
+- Über `$send_cmnd(<num>, "text", "press both buttons and\nput something into the chest")` kann der Text im Menü der Sensor Kiste gesetzt werden.
+
+Über die Checkbox "Erlaube öffentlichen Zugriff" kann eingestellt werden, ob die Kiste von jedem genutzt werden darf, oder nur von Spielern die hier Zugriffsrechte haben.
+
 
 [ta4_sensor_chest|image]
 
@@ -602,4 +612,4 @@ Beim Weitergeben wird in der Zielmaschine pro Item nur eine Position im Inventar
 
 Die Verarbeitungsleistung beträgt bis zu 8 Items alle 3 Sekunden.
 
-[ta4_injector|image]
\ No newline at end of file
+[ta4_injector|image]
diff --git a/manuals/manual_ta4_EN.md b/manuals/manual_ta4_EN.md
index 04acecd..665ca46 100644
--- a/manuals/manual_ta4_EN.md
+++ b/manuals/manual_ta4_EN.md
@@ -388,7 +388,16 @@ The server is used for the central storage of data from several Lua controllers.
 
 ### TA4 Sensor Box / Chest
 
-The TA4 sensor box is used to set up automatic warehouses or vending machines. It has additional commands for remote control.
+The TA4 sensor box is used to set up automatic warehouses or vending machines in conjunction with the Lua controller.
+If something is put into the box or removed, or one of the "F1" / "F2" keys is pressed, an event signal is sent to the Lua controller.
+The sensor box supports the following commands:
+
+- The status of the box can be queried via `state = $read_data(<num>, "state")`. Possible answers are: "empty", "loaded", "full"
+- The last player action can be queried via `name, action = $read_data(<num>, "action")`. `name` is the player name. One of the following is returned as `action`: "put", "take", "f1", "f2".
+- The contents of the box can be read out via `stacks = $read_data(<num>, "stacks")`. See: https://github.com/joe7575/techage/blob/master/manuals/ta4_lua_controller_EN.md#sensor-chest
+- Via `$send_cmnd(<num>, "text", "press both buttons and\nput something into the chest")` the text can be set in the menu of the sensor box.
+
+The checkbox "Allow public chest access" can be used to set whether the box can be used by everyone or only by players who have access/protection rights here.
 
 [ta4_sensor_chest|image]
 
@@ -513,9 +522,9 @@ The processing power is 12 items every 2 s, if TA4 tubes are used on both sides.
 The TA4 pusher has two additional commands for the Lua controller:
 
 - `config` is used to configure the pusher, analogous to manual configuration via the menu.
-  Example: `$ send_cmnd(1234, "config", "default: dirt")`
+  Example: `$send_cmnd(1234, "config", "default: dirt")`
 - `pull` is used to send an order to the pusher:
-  Example: `$ send_cmnd(1234, "pull", "default: dirt 8")`
+  Example: `$send_cmnd(1234, "pull", "default: dirt 8")`
   Values ​​from 1 to 12 are permitted as numbers. Then the pusher goes back to `stopped` mode and sends an" off "command back to the transmitter of the" pull "command.
 
 [ta4_pusher|image]
@@ -552,8 +561,8 @@ The chest can only be used by players who can build at this location, i.e. who h
 The chest has an additional command for the Lua controller:
 
 - `count` is used to request how many items are in the chest.
-  Example 1: `$ read_data(CHEST, "count")` -> Sum of items across all 8 stores
-  Example 2: `$ read_data(CHEST, "count", 2)` -> number of items in store 2 (second from left)
+  Example 1: `$read_data(CHEST, "count")` -> Sum of items across all 8 stores
+  Example 2: `$read_data(CHEST, "count", 2)` -> number of items in store 2 (second from left)
 
 [ta4_8x2000_chest|image]