This valve is used with the dash mounted control valve. It attaches on the back of the tractor cab.
All ports are maked for the correct line.
Trailer Emergency,
Trailer Service,
Tractor Emergency,
and Tractor Service.
It has a weight of 12.8 oz.
The valve can be used as a replacement for OEM 279000, 34068, 227672, 280830, 280932, 288055, 401228, 437286, 524220, 701104, 801512, 825386, 1734941, 17356002, 227672X, 25K0645, 279000R, 4503M5, 56929AX, 776407C91, R279000, S8887.
Watch the video for more info like dimensions: