Midland Industries 590400C Dot Push-to-connect Plug 1/4 in

Product Description

The MIDLAND INDUSTRIES 590400C is a D.O.T.-rated push-to-connect plug designed to cap or terminate air lines in pneumatic systems. It uses a plug-in stem connection that inserts directly into a push-to-connect fitting body, sealing the port without additional tools or thread sealant. The composite plastic body meets D.O.T. composite body standards, making it appropriate for use in commercial vehicle air brake and air supply systems. At 0.01 pounds, it is a lightweight single-use or serviceable component suited for fleet maintenance technicians and plumbing professionals working on compressed air distribution lines.

This plug is used primarily to terminate or temporarily cap 1/4 inch push-to-connect ports in air brake supply lines, auxiliary air systems, and pneumatic control circuits on commercial trucks, trailers, and related equipment. It is well suited for fleet shops, trailer repair facilities, and any application requiring a quick, tool-free port seal that meets D.O.T. composite body push-to-connect specifications.

Key Features

• D.O.T. composite body rated for commercial vehicle air systems
• 1/4 inch plug-in stem for tool-free push-to-connect installation
• Lightweight plastic construction at 0.01 pounds
• Compact profile: 1.3 inches in length, 0.3 inches in height and width
• Minimum order quantity of 1, available as a single piece

Compatibility

Designed as an OEM-style replacement or service plug for D.O.T. composite body push-to-connect fitting systems using a 1/4 inch plug-in stem connection.

Installation Notes

Installation is performed by pressing the plug-in stem firmly into the receiving push-to-connect port until it seats fully. Always depressurize the air system completely before installing or removing any push-to-connect fitting or plug. Verify that the receiving fitting is rated for the same D.O.T. composite body standard before connecting. This component is typically installed and serviced by diesel mechanics and fleet maintenance technicians working under applicable FMCSA air brake regulations.