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The Meritor Tire Inflation System (MTIS™) by P.S.I. can be installed on most major trailer axle models and is available for new trailers and can be retrofitted on trailers already in service.

How it worksMeritor Tire Inflation System:

  1. Our system starts with a pressure protection valve installed in the trailer air supply tank.  

  2. The on/off valve is located to the left side of the control box for ease of maintenance. 

  3. Pressurized air flows into the control box where the pressure is regulated to the pre-set tire cold pressure setting.

  4. Regulated air flows from the control box through the hollow axle tube to the rotary union located in the wheel end.

  5. Air is transferred pneumatically as needed via the rotary union into the tire hoses, then into the tires.