New Self-Sealing Valve for Truck Tractor & Trailer Air Systems

This main & trailer self-sealing air valve is a heavy-duty pneumatic fitting specially built for semi-truck tractor-trailer air brake systems. Adopting an integrated ball valve structure, it delivers large airflow with zero air resistance. It enables smooth connection and disconnection between tractor and trailer air lines, with reliable self-sealing and exhaust functions. Built for professional truck drivers and fleet maintenance, it solves common headaches like tight coupling, poor airflow, air leakage and difficult trailer decoupling. ✅ Integrated Ball Valve Construction One-piece ball valve design removes air flow restriction. Delivers high volume airflow without pressure drop, keeps your air brake system working at full efficiency. ✅ Smooth Plug & Release with Exhaust Built-in exhaust port allows easy insertion and removal of the air coupling. No fighting to disconnect trailer air hoses, saves massive time during trailer hook-up and drop-off. ✅ Reliable Self-Sealing & Self-Locking Self-sealing structure prevents air leakage after connection. Self-locking function secures the fitting tightly during operation, avoids accidental disconnection while driving. ✅ Universal Connector Design Multi-purpose universal coupling, compatible with most standard tractor-trailer air line fittings. One fitting works with multiple attachments for flexible installation. ✅ Heavy-Duty Solid Brass Build Solid brass valve body with red/blue color-coded knobs for easy identification of service & emergency air lines. Corrosion-resistant, stable performance under long-term vibration and high air pressure in truck applications. ✅ Color Coded for Quick Identification Red and blue assemblies match standard North American trailer air line color coding, easy to tell emergency and service lines apart during maintenance.