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Relay used to apply and release service brakes on tractor or trailer.Compact size.Two port delivery.Two mounting holes, 0.34 diameter on 1.50" centers.Approximate Weight 1.5 lbs.OEM Part # 281865Technical Specifications:Cracking pressure: 5.6 +/- 1.0 PSIControl Port: 1/4"Supply A: 1/2"Delivery C: 3/8"Delivery D: 3/8"Control Position: 90°Plugs: 1 @ 1/2", 1 @ 3/8"OEM Part #: KN28510Width: 3-1/2"Length: 3-1/2"Height: 3-5/8"Comes with Safety Caps to Protect the Threads and Mechanism prior Installation.No Core Charge.Warranty 12 MonthsSold IndividuallyMay also Work as a Replacement for Part: 9125, 20015, 23254, 34026, 65309, 65309, 102537, 103009, 103009, 103065, 104596, 106285, 107441, 294866, 641088, 793580, 800238, 803022, 825553, 985407, 1092929, 3935413, 10130393, 065309X, 102537X, 103009X, 103065X, 107441X, 110197. 110410, 1614572C91 , 1677541C91, 182778H1, 20QE1320, 20QE347P1, 20QE458, 25AA0630, 4C111, 501521R1, 65309X, AKA3927, E0917B011, E3HT2A449AA, E6HT2A449AA, E6HT-2A-449AA, E6HZ2A449B, EO917BO11, F3HS2A449AA, K2953681, KN28060, KN28061, KN28132, KN28140, KN28510, S6006A, T294866, T294866C.