The Wabco Relay Valve, part number 9718991200 (also referenced as S971 899 120 0), is a genuine OE-specification air brake relay valve for heavy-duty truck brake systems. It handles a maximum operating pressure of 150.84 psi and operates across a temperature range of -40°C to +80°C. The valve mounts via two M8 fasteners and measures 196 x 164 x 142 mm. Port threads include 1/2"-14 Dry Seal NPTF on ports 1 and 2, and 3/8"-18 NPTF or NPTF variants on ports 21, 22, 41, and 42. Sold by Pro Gear and Transmission. Call us to confirm proper fit for your application.
Features
Maximum operating pressure: 150.84 psi
Temperature range: -40°C to +80°C
Mounting: 2x M8
Port threads 1 and 2: 1/2" - 14 Dry Seal NPTF
Ports 21, 22, 41, 42: 3/8" - 18 NPTF
Dimensions: 196 x 164 x 142 mm
Tech Specs
- Brand: Wabco
- OE specification: Yes
- Max. operating pressure: 150.84 psi
- Temperature range: -40°C to +80°C
- Mounting: 2x M8
- Port thread 1: 1/2" - 14 Dry Seal NPTF
- Port thread 2: 1/2" - 14 Dry Seal NPTF
- Port thread 21: 3/8" - 18 NPTF
- Port thread 22: 3/8" - 18 NPTF
- Port thread 41: 3/8" - 18 NPTF
- Port thread 42: 3/8" - 18 NPTF
- Dimensions (L x W x H): 196 x 164 x 142 mm
