The Sundström SR307/507 Control Valve is a Pressure Regulator for supplied-air pressure to respirator masks
This replacement regulator controls supplied air for masks and hoods, plus has an additional air outlet for compressed-air tools. Does NOT include adaptor or hose to connect to masks/hoods etc.
Can be used as a replacement regulator for:
SR307 airline-to-face-mask-adapter kit
SR63 airline-to-Compressed-Air-hood kit