This is model r-12dc and has 2 check valves; the model r-12 has only one check valve.
A valve specifically designed for installation in an air brake system. It is used on trailers, long wheel base vehicles, as well as multiple rear axle vehicles. It serves to speed and synchronize the application and release of air operated service or parking brakes. It may include emergency features for trailer application.
Classification: Other taps, cocks, valves, etc., nesoi
NSN 6650-00-751-9958
NSN 6135-01-255-9129
NSN 6220-01-601-5320
NSN 2925-01-035-7699
NSN 5998-01-099-1222
NSN 6135-00-299-6918
NSN 5835-00-833-7080
NSN 6110-01-464-9808
NSN 5990-01-278-9985
NSN 5855-01-363-1143
NSN 5975-01-045-2159
NSN 6130-00-578-6637