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 5925-01-088-6863
NSN 5965-00-871-8987
NSN 5925-01-509-7873
NSN 5935-01-461-7008
NSN 5930-00-567-3305
NSN 2925-01-068-3844
NSN 5975-01-092-2111
NSN 5855-01-088-8700
NSN 6130-01-009-5418
NSN 5950-01-625-7136
NSN 6145-01-478-1722
NSN 6650-01-352-7111