Midland Industries 621000M Dot Union 10mm Push-to-connect Brass

Product Description

The MIDLAND INDUSTRIES 621000M is a D.O.T.-rated brass union fitting designed for 10mm push-to-connect tubing on both ends. It creates a secure, tool-free inline connection in compressed air and pneumatic brake line systems where Department of Transportation compliance is required. Rated to 150 psi with a working temperature range of -40 to 200 degrees F, this union is built for demanding mobile and commercial vehicle applications. The all-brass construction resists corrosion and withstands vibration common in vehicular environments. Licensed HVAC technicians, fleet mechanics, and plumbing pros working on air brake or pneumatic systems will find this fitting a straightforward drop-in solution.

The 621000M is used in D.O.T.-compliant pneumatic systems, most commonly air brake circuits on commercial trucks, trailers, and other regulated vehicles. It is also suitable for general compressed air plumbing where push-to-connect brass fittings are specified. The union configuration allows an inline connection or reconnection of two 10mm tubing runs without additional tools, making it practical for field repairs and new installations alike.

Key Features

• D.O.T.-rated construction meets federal requirements for air brake and pneumatic brake line systems
• Dual 10mm push-to-connect ports allow fast, tool-free tubing insertion on both sides
• 150 psi maximum working pressure suits standard compressed air brake circuits
• Wide temperature range of -40 to 200 degrees F handles extreme operating environments
• Solid brass body provides corrosion resistance and mechanical durability

Compatibility

Designed as an OEM-style D.O.T. brass union for systems using 10mm push-to-connect tubing in pneumatic and air brake plumbing applications.

Installation Notes

Installation is typically performed by qualified fleet mechanics or pneumatic system technicians. Depressurize the air system completely before disconnecting or installing any fitting. Ensure tubing ends are cut cleanly and squarely with no burrs before inserting into the push-to-connect ports, as irregular cuts can compromise the seal. Verify compliance with applicable D.O.T. regulations and any relevant vehicle or facility codes before placing the system back in service.