If you're a firefighter you have worked with CGA Valves on SCBA's. This SCBA to Scuba Adapter allows filling off fire department compressor equipped with a CGA 346 filler whip to fill scuba tanks up to 3200 psi (220 bars) using this adapter. The Adapter consists of scuba yoke, bleeder block, and CGA 346/347 adapter. The Adapter is made from durable corrosion resistant chrome plated brass, brass and plastic. The adapter has an impact resistant yoke knob that is easy to handle with gloved hands.