Features Excellent metal: the adapter hose set is made of stainless steel and brass, which is rust and corrosion resistant and will not deform or wear out for a long time. Pressure gauge: equipped with a pressure gauge, the air pressure range can be clearly displayed, which allows the pressure to be conveniently regulated in a safe range. SPECIFICATIONS The hose has a working pressure of 1500 PSI, the pressure gauge 3000 PSI, the thread is CGA320 for large CO2 tanks and TR21-4 for beverage cans. Easy to install: this bottle refill adapter is compact and equipped with seals for easy installation. Use a wrench to tighten the connector to avoid leakage. DOUBLE VALVES This adapter has two ON/OFF valves, one for CO2 control from the large to the small bottle and the other to drain excess gas after filling. Specification: Item Type:CO2 Cylinder Refill Adapter Material: stainless steel, brass. Connection specification: CGA320. Hose length: 36 inches. Package list: 1 x adapter. 3 x seals. 1 x user manual (English language not guaranteed). Tips: 1. Please read the instructions before use, the large CO2 tank (gas storage bottle) should have sufficient pressure. If it is liquid CO2, turn the large tank upside down or freeze the soda bottle for a while to inflate. If the small canister still does not inflate according to the instructions, we recommend replacing the thin thimble canister. Cannot be used in paintball CO2 tanks. Cannot be used with new CO2 bottles. 2. If the stainless steel mesh hose expands, check if the thimble of the vial is too thick to inflate. If this is the case, replace the thin thimble bottle and it can be used normally Package List 1 x Adapter 3 x Gaskets 1 x User Manual