[MIRROR] Adds Inflation (#12771)

Co-authored-by: Cameron Lennox <killer65311@gmail.com>

code/game/objects/items/devices/transfer_valve.dm

@@ -10,6 +10,10 @@
 	var/valve_open = 0
 	var/toggle = 1
 
+/obj/item/transfer_valve/Initialize(mapload)
+	. = ..()
+	AddElement(/datum/element/sellable/transfer_valve)
+
 /obj/item/transfer_valve/attackby(obj/item/item, mob/user)
 	var/turf/location = get_turf(src) // For admin logs
 	if(istype(item, /obj/item/tank))

code/game/objects/items/weapons/tanks/tanks.dm

@@ -510,9 +510,10 @@ GLOBAL_LIST_EMPTY(tank_gauge_cache)
 				log_world(span_warning("[x],[y] tank is leaking: [pressure] kPa, integrity [integrity]"))
 				#endif
 
-
+		/* //This resulted in tanks going into negative values of integrity forever. Integrity should only be lost if the tank is moving towards exploding.
 		else
 			integrity-= 1
+		*/
 
 
 	else