Excel EM56170 Mack 745-289395 Relay Valve

Relay Valve R-8 (2) 1/2in-14 Supply Ports (2) 1/2in-14 Delivery Ports (1) 1/4in-18 Service Port Aluminum

• Part number: EM56170
• OE MFG: MACK
• OEM Reference: 745-289395
• Cross Reference: OTHER : 20QE410, 745-289395
• Product Class: Air Valves & Kits

The PAI EM56170 is an Excel Relay Valve R-8 with two 1/2in-14 supply ports, two 1/2in-14 delivery ports, and one 1/4in-18 service port. Relay valves are heavy duty diesel truck parts that use a control signal to route compressed air through a vehicle air-brake system. The port count and thread sizes identify the required air-line connections for this valve. MACK lists 745-289395 as the OEM reference; 20QE410 is an additional cross-reference.