Features Specifications: The cylinder refill adapter hose is 1500 PSI working pressure, the gauge is 3000 PSI, the thread is CGA320 for large CO2 tanks, and TR21-4 for soda cans. with Pressure Gauge: Equipped with pressure gauge, can clearly see the air pressure range, the cylinder refill adapter is convenient to control the pressure within a safe range. Dual Valves: This adapter has dual ON Off valves, one to control CO2 from the large to the small cylinder and the other to release excess gas after filling. Easy to Install: This cylinder refill adapter is compact and equipped with gaskets for easy installation, use a wrench to tighten the connector to avoid leakage. Premium Metal Material: The adapter hose set is made of stainless steel and brass, which is rust and corrosion resistant, and will not be deformed or worn for a long time. Specification: Item Type: CO2 Cylinder Refill Adapter Material: Stainless steel, brass Connector Specification: CGA320 Hose Length: 36in Package List: 1 x Adapter 3 x Gaskets 1 x User Manual Note: 1. Please read the instructions before use; the large CO2 tank (gas supply 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 following the instructions the small canister still does not inflate, we recommend replacing the thin thimble canister. Cannot be used in paintball CO2 tanks. Cannot be used with new CO2 bottles. 2. When the stainless steel woven hose expands, check whether the thimble of the vial is too thick to inflate. If there is, replace the thin thimble bottle and it can be used normally Package List 1 x Adapter 3 x Gaskets 1 x User Manual