SCUBA Tank Fill Yoke to get the air from the tank to your portable tank or rifle reservoir. Will work on any scuba k valve 1/4" NPT Foster Quick-Disconnect (Female) to attach your fill hose. 6000psi output gauge. Bleed-off to release pressure from fill hose before disconnecting. Please Note: This is a "K-valve" style yoke that fits modern connectors and will not fit older SCUBA tanks utilizing a "J-valve" style connector.