Deluxe Brass Yoke Filler with On / Off Valve, Bleeder and Gauge Port for Scuba Tank Filling - Thermo Cascade (CV120) Compact Scuba Tank Filler Built-In On / Off Valve and Twist Bleeder For Filling of "Yoke Style" Scuba Valves Attach to your High Pressure Air Compressor Fill Whip (Hose) with 1/4" NPT Female Inlet Threads on the Filler Remove 1/4" NPT Plug to Allow you to Add Fill Pressure Gauge