Cage 4w594 calls item a "valve assist" while cage 06853 refers to item as "qri quick release"
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 5985-01-098-4672
NSN 5835-00-733-9145
NSN 5990-00-099-0822
NSN 5999-01-209-9437
NSN 6105-00-578-8114
NSN 5905-01-389-6129
NSN 5920-01-118-5688
NSN 5998-00-470-8226
NSN 2925-01-439-4451
NSN 2925-01-515-3032
NSN 6320-01-364-1840
NSN 5920-01-378-6312