RT4 Multi-Function Trailer Control Valve | KN26020 Haldex

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Meets all FMVSS-121 trailer requirements for spring brake control and other regulations prior to Oct. 8, 1992. Interchangeable with competitive units. Used on trailers to control b oth parking and emergency brake functions. Controls reservoir charging. Applies emergency (parking) brakes upon loss of trailer supply (emergency) line pressure. Trailer control port is over reservoir port A. Repair Kit use part number RN10JM. Product Specifications Trailer Supply (A): Plugged Trailer Supply (B): 3/8" Trailer Control: 3/8" Reservoir (A): 1/2" Reservoir (B): 3/8" Delivery (4): 3/8" PPV Closing Pressure: 70 PSI OEM Part Number: N4305A Show more