With this transfiller adapter, you can refill small oxygen cylinders from a larger one. Adapter has a 36" flexible connecting hose. Maximum working pressure is 3,000 psi. For for use with CGA 540 inlet valves.
This model has flow restrictions built into the end connections. This eliminates the need for a restrictor body/pressure relief valve. After transfilling, pressure is released by loosening the hex nut on the transfill/cylinder connection.