It is used to control parking and emergency brakes.
All ports are marked.
The automatic release pressure is 40 PSI. Fitting size is 3/8" on all ports.
It can be used as a replacement for part 14028, 34013, 101279, 101478, 101850, 276567, 276567, 284171, 284726, 287054, 401135, 1092903, 2000913, 2014412, 15149895, 15149896, 15633206, 27116875, 76049094, 101279X, 101478X, 101850X, 20Q278P5, 20QE278P4, 20QE278P8, 25BG0460, 284171X, 380509C92, AV276567, C3TA2A622A, E0HT2A622EA, EOHT2A622EA, KN20021, LPP3619, R955276567, RKN20001, S5675, XC353730, ZAC276567
The valve weighs 0.7 lbs.
Watch video for more info like dimensions: