Meritor Tire Inflation Flex Hose 31373-00
Updated June 9, 2026
The Meritor 31373-00 is a genuine OEM flex hose used in the Meritor Tire Inflation System (MTIS) for commercial trailers. It is installed inside the tire and connects the axle-mounted inflation system to the tire valve, maintaining proper tire pressure automatically. This 17-inch-long hose is designed for wheels larger than 17.5 inches and also fits super single tires.
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How It Works
The flex hose is part of the MTIS wheel-end assembly. It delivers air from the trailer's inflation system through the axle to the tire. The hose is made to withstand extreme temperatures from –40°C to +100°C and is DOT approved. When the system is active, the hose allows continuous air flow to keep tires at the set pressure.
Common Failure Symptoms
A leaking or damaged flex hose will cause the MTIS to lose pressure, resulting in underinflated tires. Listen for air hissing near the wheel end or observe tire pressure warning lights. Visible cracks, abrasions, or cuts on the hose indicate need for replacement.
Installation Notes
This hose is mounted inside the tire on wheels larger than 17.5 inches. Ensure the hose is routed properly to avoid pinching. Straight fitting type. Use only with compatible MTIS components. Check that the hose length (17 inches) is correct for the wheel size.
