CO2 Cylinder Refill Adapter Accessories with 3000PSI Gauge Filling Tank with
Optional Thread: TR21-4 to CGA320 or TR21-4 to W21.8-14 cylinder refill adapter connector.The refill adapter can be used to refill small CO2 tanks from larger CO2 tank, with 2 valves. 1 Piece CO2 Cylinder Refill Adapter Bottle Connector.