Suit for W21.8 interface, DC 12V, intimate design, more suitable. Safe, safe and reliable material, more pressure than ordinary aluminum pressure reducing valve, much stronger, longer service life. Precise and fine tuning of the gas emission. The adjustment is sensitive and the output is stable. The table configuration is more intuitive, can clearly show the working status of the CO2 system, the lack of pressure is too large or too small at a glance. longer service life. The siphon phenomenon caused by the water pressure after the gas stops, causes some of the water to flow back into the pipe. The check valve can prevent water from entering the watch. Product Specification: Material: Aluminuml