Midland Industries LF66-106 Compression Coupling 5/8 X 3/8 in

Product Description

The MIDLAND INDUSTRIES LF66-106 is a lead-free brass compression coupling designed to connect copper, aluminum, or plastic tubing to a female iron pipe (FIP) threaded port. It transitions a 5/8 inch compression side to a 3/8 inch FIP connection using a 13/16-18 x 3/8-18 thread specification. Built from lead-free brass, this fitting meets modern plumbing code requirements for potable water applications. It handles a temperature range of -40 to 250 degrees F, making it suitable for both cold supply and moderate-heat service lines. Plumbers and pipefitters install this fitting where a compression tube run must terminate or transition into a threaded female port.

This coupling is used in residential and light commercial plumbing systems wherever copper, aluminum, or plastic tubing needs to be joined to a FIP-threaded fitting or valve. Common install scenarios include under-sink supply connections, refrigerator ice-maker lines, and similar small-diameter potable water runs. The compression design allows installation without soldering, making it accessible for service work in confined spaces or in systems that cannot be drained and dried for sweating.

Key Features

• Lead-free brass construction meets potable water compliance requirements
• 5/8 inch compression inlet connects directly to copper, aluminum, or plastic tubing
• 3/8 inch FIP outlet for connection to female-threaded ports or valves
• Thread specification: 13/16-18 compression x 3/8-18 FIP
• Rated for -40 to 250 degrees F service temperature
• No-solder compression design speeds up installation in tight spaces

Compatibility

Designed for use with copper, aluminum, or plastic tubing on systems requiring a 5/8 inch compression to 3/8 inch FIP transition in potable water or fluid-handling service lines.

Installation Notes

This fitting is installed by licensed plumbers in accordance with applicable local plumbing codes and IPC guidelines. Shut off the water supply and depressurize the line before disassembly or installation. Ensure tubing ends are cut cleanly and deburred before seating in the compression ferrule to prevent leaks. Do not overtighten the compression nut, as this can deform the ferrule and compromise the seal.