Specifications Product Line: Brakes Category Name: Air Brake Valves Part Type: Trailer Valve Alternate Part Name: Multi-Function Trailer Valve Model: RT-4 OEM Part Number: KN26000 Application Type: Heavy Duty Trucks, Semi-Trucks Control Port Size: 3/8-18 NPT Delivery Port Qty: 4 Delivery Port Size: 3/8-18 NPT Reservoir Port Size: 3/8-18 NPT, 1/2-14 NPT Supply Port Size: 3/8-18 NPT Supply Port Qty: 2 Material: Die-cast Aluminum Closing Pressure: 55 psi Net Weight: 4.64 lb. Intended Application Used on trailers to control both parking and emergency brake functions. Controls reservoir charging. Applies emergency (parking) brakes upon loss of trailer supply (emergency) line pressure. Meets all FMVSS-121 trailer requirements for spring brake control and other regulations prior to Oct. 8, 1992. Interchangeable with competitive units. Cross-references 170.KN26000, 170KN26000, 5396-KN26000, 5396KN26000, EM40760, FTV4076, KN26000, KN26000N, KN26000RX, R955KN26000N, ZZKN26000N