Remanufactured Sealco Emergency Relay Valve, Used on converter dollies and pre-1975 trailers. 4-port delivery. Repair kit not available. KN30300 and KN30300X Valve may also be used for this application. 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