Relay Valve R-12 Without Mounting Bracket (1) 1/2in-14 Supply Port (4) 3/8in-14 Delivery Ports (1) 1/4in-18 Service Port 4 psig Cracking Pressure Part number: 802638E OE MFG: BENCHMARK TECHNOLOGY GROUP OEM Reference: 65104 Cross Reference: NAVISTAR : 1617037, 1617037C91; ROCKWELL (EXCEL PRODUCTS) : R955065104N; OTHER : 065104, 5003365X, 65104, S19390, S-19390, SM3064, SM-3064 | PAI : 802638 Product Class: Air Switches The EXCEL 802638E is an R-12 relay valve without a mounting bracket, identified by Benchmark Technology Group reference 65104. Relay valves are heavy duty diesel truck parts that use a control signal to regulate compressed-air delivery in a vehicle air-brake system and place air near the service brakes for rapid actuation. Its listed configuration includes one 1/2in-14 supply port, four 3/8in-14 delivery ports, one 1/4in-18 service port, and a 4 psig cracking pressure; Navistar cross-reference 1617037C91 is also listed.