Premium World American TP-3 style tractor protection valve; replaces OE TP-3 models with durable NPT-threaded ports and reliable function in commercial brake systems Features 1/4" and 1/2" NPT emergency ports and 0.375"/0.5" NPT service ports; ensures precise airflow control and tractor-trailer protection Designed with high-quality internal valve components for resistance to pressure loss, air leaks, and long-term wear Compatible with numerous OEM and aftermarket valve references including Bendix 279000, Haldex KN34060, Mack 20QE377, and more Includes (1) World American MWT 279000 Tractor Protection Valve with standard TP-3 layout and port dimensions; meets or exceeds DOT specs