Remanufactured Bendix SR-1 Spring Brake Valve, Used on trucks and tractors with dual air brake systems. Spring brake release pressure is limited to 90-95 PSI through the SR-1. Normal parking functions are controlled through the SR-1. Repair Kit use part number: 287072K. Product Features:Remanufactured parts are completely disassembled and wearable parts replaced providing longer life than rebuilt partsISO 9001 and MERA member certifying repeatable processesRemanufactured in the USA