Dual Heavy Duty 1/4 turn valves. Allows to use any large CO2 tank as a refill station. This is a Co2 fill station for filling small Soda Maker CO2 Tanks. This fill station connector is CGA320 (Standard for CO2 Industrial tanks). You can refill your CO2 tank for your Soda Maker and save money on refills. Don't settle for the single valve fill stations which require you to use the bulk tank valve to fill your tanks. This fill station has 2 quarterturn heavy duty ball valves for filling, so it is faster and much easier on your hands than the single valve fill stations.