Mueller Industries MUE-A00479 45 Degree Flare Connector

Product Description

The MUELLER INDUSTRIES MUE-A00479 is a 45-degree flare connector designed for joining refrigerant or gas lines with mismatched flare sizes. It features an internal flare on one end and an external flare on the other, allowing a 1/4 inch connection to mate with a 3/8 inch connection without additional adapters. Weighing 0.078 pounds, this compact brass fitting is a standard-duty component used by HVAC technicians and refrigeration service pros during line-set connections, system retrofits, and service repairs requiring a size transition between flared tubing ends.

This fitting is suited for residential and light commercial HVAC and refrigeration applications where a flare-to-flare size transition is required. It is commonly installed during line-set modifications, equipment changeouts, or service calls where existing tubing must connect to a different port size. The 45-degree flare seat profile provides a leak-resistant mechanical seal without solder or brazing, making it a quick-connect solution in appropriate low-pressure flare applications.

Key Features

• Transitions from 1/4 inch flare to 3/8 inch flare in a single fitting
• Internal flare to external flare configuration for direct inline connection
• 45-degree flare seat design provides a metal-to-metal leak-resistant seal
• Lightweight at 0.078 pounds for easy handling in tight spaces
• No solder or brazing required at the flare connection points

Compatibility

Designed as an OEM-style replacement or service fitting for residential and light commercial HVAC and refrigeration systems using standard 45-degree flare connections with 1/4 inch and 3/8 inch tubing ends.

Installation Notes

Installation should be performed by a licensed HVAC technician or refrigeration mechanic. Always recover or isolate refrigerant and depressurize the line before disassembling or assembling flare fittings. Use a calibrated flare tool to ensure proper 45-degree flare geometry on the tubing ends before tightening. Do not overtighten flare nuts, as this can crack the flare seat and cause leaks.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.