Midland Industries LF66-812 Compression Coupling Brass

Product Description

The MIDLAND INDUSTRIES LF66-812 is a lead-free brass compression coupling designed to connect 1/2 inch compression fittings to 3/4 inch female iron pipe (FIP) threads. It features an 11/16-20 compression thread on one end and a 3/4-14 FIP thread on the other, making it a reliable transition fitting for mixed-connection plumbing runs. Constructed from lead-free brass, this coupling meets modern potable water standards and is rated for temperatures from -40 degrees F to 250 degrees F. Licensed plumbers and HVAC technicians install this fitting in water supply, hydronic, and refrigeration tubing applications.

This coupling is suited for residential and light commercial plumbing installations where a compression-to-FIP transition is required. It is compatible with copper, aluminum, or plastic tubing on the compression side, giving installers flexibility when working with existing or new tubing runs. Typical applications include water supply connections, valve hookups, and service line transitions where a tool-free compression connection is preferred on the tubing end.

Key Features

• Lead-free brass construction meets potable water compliance requirements
• 1/2 inch compression x 3/4 inch FIP transition for mixed-thread connections
• Thread specification: 11/16-20 compression x 3/4-14 FIP
• Rated from -40 degrees F to 250 degrees F for broad temperature compatibility
• Compatible with copper, aluminum, or plastic tubing on the compression end

Compatibility

Designed for use with copper, aluminum, or plastic tubing on the compression side. Suitable for residential and light commercial plumbing systems requiring a 1/2 inch compression to 3/4 inch FIP adapter connection.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable IPC or local plumbing codes. Shut off water supply and depressurize the line before making any connections. On the compression end, ensure tubing is cut cleanly and deburred before seating to prevent leaks. Do not overtighten the compression nut, as brass fittings can be damaged by excessive torque.