Midland Industries 704048-0606 Flare Half Union Adapter

Product Description

The MIDLAND INDUSTRIES 704048-0606 is a SAE 45-degree flare half union adapter designed to connect male flared tubing to a male NPTF threaded port in refrigeration, HVAC, and plumbing systems. Manufactured from lead-free brass, this adapter features a 5/8-18 male flared thread on one end and a 3/8-18 male NPTF thread on the other, covering both connection types in a compact, single-piece fitting. The lead-free construction meets potable water and environmental compliance requirements. Licensed plumbers, HVAC technicians, and refrigeration service professionals install this fitting during line set connections, appliance hookups, and system retrofits where dissimilar thread types must be joined.

This adapter is suited for residential and light commercial applications involving gas, refrigerant, or fluid distribution lines. It is rated for temperatures from -40 degrees F to 250 degrees F, making it appropriate for a wide range of system operating conditions. The fitting is compatible with copper, brass, aluminum, and steel tubing, giving technicians flexibility across common tubing materials found in the field. Its compact profile fits into tight mechanical spaces where bulk fittings are not practical.

Key Features

• SAE 45-degree flare half union design joins male flared tubing to male NPTF port
• Lead-free brass construction for compliance in potable water and environmentally regulated systems
• Thread sizes: 5/8-18 male flared x 3/8-18 male NPTF
• Temperature rated from -40 degrees F to 250 degrees F
• Compatible with copper, brass, aluminum, and steel tubing
• Compact dimensions suitable for tight installation spaces

Compatibility

Designed for use with copper, brass, aluminum, and steel tubing in SAE 45-degree flare systems requiring a male flared to male NPTF transition fitting.

Installation Notes

This fitting should be installed by a licensed plumber or qualified HVAC technician following applicable local codes and IFGC or IPC guidelines. Shut off all system pressure and depressurize the line before making or breaking any flare connections. Use a calibrated flare tool to ensure proper SAE 45-degree flare geometry on the tubing before tightening. Do not overtighten the flare nut, as this can damage the seating surface and cause leaks.