Midland Industries 704048-0812 Flare Half Union Adapter

Product Description

The MIDLAND INDUSTRIES 704048-0812 is a lead-free brass SAE 45-degree flare half union adapter designed to connect a 1/2-inch male flared fitting to a 3/4-inch male NPTF threaded port. The fitting features a 3/4-16 thread on the flare side and a 3/4-14 thread on the NPTF side. Built from lead-free brass, it meets regulatory requirements for potable water and fuel-line applications. Licensed plumbers, HVAC technicians, and refrigeration mechanics rely on this type of adapter to transition between SAE flare tubing connections and standard tapered pipe threads in tight mechanical systems.

This adapter is suited for residential and light commercial installations involving copper, brass, aluminum, or steel tubing. Typical applications include fuel gas lines, refrigerant piping, compressed air systems, and hydraulic circuits where an SAE 45-degree flare must mate to a male NPTF pipe thread. The rated temperature range of -40 degrees F to 250 degrees F makes it appropriate for both heating and cooling system installations as well as fuel supply line work.

Key Features

• Lead-free brass construction meets regulations for potable water and fuel-line use
• SAE 45-degree flare seat on the 1/2-inch male flared end for a leak-resistant metal-to-metal seal
• 3/4-inch male NPTF taper thread provides a dry-seal connection without requiring sealant tape in many applications
• Compatible with copper, brass, aluminum, and steel tubing
• Wide operating temperature range: -40 degrees F to 250 degrees F
• Compact profile at approximately 1.6 inches in length for use in tight spaces

Compatibility

Designed for use with copper, brass, aluminum, and steel tubing systems using SAE 45-degree flare fittings. Suitable for installations requiring a 1/2-inch male flared to 3/4-inch male NPTF transition in plumbing, HVAC, refrigeration, or fuel-line service.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified mechanic in accordance with applicable local codes and the IFGC or IPC as relevant. Always depressurize and isolate the line before disassembly or fitting installation. Hand-tighten the flare nut onto the flare seat before applying a wrench to avoid cross-threading or damaging the 45-degree seat. Inspect the flare cone for burrs or deformation prior to assembly, and verify thread engagement on the NPTF side meets the connection requirements for the specific application.