Midland Industries 590800 Dot Push-to-connect Plug 1/2 in

Product Description

The MIDLAND INDUSTRIES 590800 is a D.O.T.-compliant push-to-connect plug designed to cap or terminate 1/2-inch air lines in pneumatic systems. Built from nylon with a plug-in stem configuration, it provides a secure, leak-resistant seal without tools. The fitting is rated for 150 psi working pressure and handles temperatures from -40 to 200 degrees F, making it suitable for the temperature swings common in truck, trailer, and commercial vehicle air brake circuits. Plumbers, fleet maintenance technicians, and pneumatic system installers typically use this type of plug to deactivate or cap unused ports during service or system modification.

This plug is intended for use in D.O.T.-compliant push-to-connect pneumatic plumbing, most commonly found in commercial vehicle air brake systems, trailer air circuits, and industrial compressed-air applications. The push-to-connect design allows for fast installation and removal without threading or soldering, which reduces downtime during service calls or line modifications. Its compact footprint makes it practical in tight routing environments where conventional threaded plugs may not fit cleanly.

Key Features

• D.O.T.-rated construction for use in commercial vehicle and air brake pneumatic circuits
• Push-to-connect plug-in stem design for tool-free installation and removal
• 150 psi working pressure rating
• Wide operating temperature range: -40 to 200 degrees F
• Nylon construction for corrosion resistance and lightweight performance
• Compact dimensions: 1 inch length, 0.7 inch height, 0.65 inch width

Compatibility

Designed as an OEM-style replacement or service plug for D.O.T.-compliant push-to-connect pneumatic systems using 1/2-inch stem connections, including commercial vehicle air brake and trailer air line applications.

Installation Notes

Installation should be performed by a qualified technician familiar with D.O.T. air brake and pneumatic system requirements. Always depressurize and bleed the air line completely before inserting or removing push-to-connect fittings. Verify the tubing or port end is clean and free of burrs before seating the plug to ensure a proper seal. Refer to applicable DOT FMCSA regulations and vehicle manufacturer guidelines when servicing air brake circuits.