Type QR-L Quick Release Valve engineered for heavy-duty air brake systems; ensures rapid exhaust of brake air pressure for improved brake release response. Precision Port Sizes: Supply port diameter 0.5 inch, delivery port diameter 0.5 inch, with NPT thread type for secure and leak-free connection in demanding applications. Direct Mount Design with compact 3.4-inch length for easy installation in tight spaces without performance compromise. Durable Construction built to withstand high-cycle heavy-duty operations in trucks, buses, and other commercial vehicles. Replaces Popular Part Numbers: Bendix 800333, 065707, 5003394, Automann 170.800333, Tectran 14482, Meritor R955800333N, Genuine Newstar S-18044, Volvo Truck 3093937, Mack 745-800383, and others.