Midland Industries 266X4 Compression Female Adapter

Product Description

The MIDLAND INDUSTRIES 266X4 is a brass compression female adapter designed to connect 1/4-inch compression tubing to a 1/8-inch female NPTF threaded port. It is rated for 300 psi working pressure and handles temperatures from -65 to 250 degrees F, making it suitable for a wide range of fluid and gas service applications. The fitting features a 7/16-24 x 1/8-27 thread configuration, a 0.56-inch hex for wrench engagement, and a center-to-end measurement of 0.78 inches. Licensed plumbers, HVAC technicians, and refrigeration technicians install this type of fitting in control panel manifolds, instrumentation lines, and equipment hookups.

This adapter is suited for residential and light commercial applications where copper, aluminum, or thermoplastic tubing must transition to a female NPTF threaded connection. Typical install scenarios include instrument sensing lines, pneumatic controls, fuel supply connections, and refrigeration accessory piping. The compression end eliminates the need for soldering or flaring at the tubing connection point, allowing for a faster, repeatable field connection on compatible tubing sizes.

Key Features

• 1/4-inch compression inlet connects to 1/8-inch female NPTF outlet
• 300 psi working pressure rating for demanding service conditions
• Operating temperature range of -65 to 250 degrees F
• Brass construction for corrosion resistance and durability
• 0.56-inch hex allows standard wrench installation without special tooling
• Compatible with copper, aluminum, and thermoplastic tubing

Compatibility

Designed for use with copper, aluminum, and thermoplastic tubing in compression fitting applications transitioning to 1/8-inch female NPTF threaded ports.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC or refrigeration technician. Depressurize and isolate the system before removing or installing any compression fitting. Use a backup wrench on the body hex to avoid twisting downstream tubing or connections. Verify that tubing is cut square and deburred before seating in the compression fitting to ensure a leak-free seal.