Tractor Service Port: 3/8", Tractor Emergency Port: 1/4", Trailer Service Port: 1/2", Trailer Emergency Port: 1/2"
Function: 20 - 45 PSI
High-Quality TP-3 Tractor Protection Valve. Generally mounted on the rear of the tractor cab. Two-Line Non-Automatic Style. Used in conjunction with dash-mounted control valves.