Midland Industries 20779P Union Check Valve 3/8 in Push-in

Product Description

The MIDLAND INDUSTRIES 20779P is a union-style check valve designed to allow one-directional flow and prevent backflow in pneumatic and fluid distribution lines. Built with an acetal co-polymer body in gray, the 20779P uses a push-in connection for tool-free tube insertion, making field installation fast and repeatable. It is rated for pressures from 100 to 170 psi and operates across a temperature range of 34 to 150 degrees F. The union design allows the valve to be serviced or replaced without cutting or disturbing the surrounding tubing run. Licensed plumbers, HVAC technicians, and industrial pipe fitters are the typical installers of this fitting.

The 20779P is suited for residential and light commercial applications where backflow prevention is needed in plastic push-in tubing systems. Common use cases include compressed air distribution, pneumatic controls, water supply lines, and fluid transfer systems where acetal co-polymer construction is appropriate for the media being conveyed. The push-in end connection accepts standard tubing sizes at the 3/8-inch nominal port without additional fittings, adapters, or thread sealants.

Key Features

• Push-in connection allows tool-free tube insertion and secure retention
• Union body style permits in-line service or replacement without cutting tubing
• Acetal co-polymer construction resists moisture and common chemicals in fluid systems
• Rated from 100 to 170 psi for compatibility with typical pneumatic and plumbing line pressures
• Operating temperature range of 34 to 150 degrees F covers most indoor service environments
• Compact profile at 2.05 inches long supports installation in tight spaces

Compatibility

Designed as a direct-fit replacement for 3/8-inch nominal push-in union check valve applications in plastic tubing systems where acetal co-polymer body material is specified.

Installation Notes

Shut off system pressure and relieve line pressure completely before removing or installing any check valve. Verify tubing is cut cleanly and squarely before inserting into the push-in port to ensure a leak-free seal. Confirm the flow-direction arrow on the valve body is oriented correctly before pressurizing the system. This fitting category falls under IPC and IFGC guidelines when used in relevant applications; verify local code compliance before installation.