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 6610-00-853-5657
NSN 2925-01-203-0493
NSN 6145-01-228-6267
NSN 5910-01-440-9558
NSN 6220-01-346-6643
NSN 5985-00-269-3443
NSN 5895-01-123-4800
NSN 5925-01-289-5871
NSN 6220-01-139-7340
NSN 5835-01-229-6964
NSN 5960-00-421-7560
NSN 6620-00-990-3385