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.

Technical Specifications

• Connection Size: 1/4 inch
• Second Connection Size: 3/8 inch
• End Type: Flare
• Second End Type: Flare
• Flare Angle: 45 degrees
• Weight: 0.078 pounds
• Universal Category Code: UR3-64

Standard Information

• Brand: MUELLER INDUSTRIES
• Manufacturer Part Number: MUE-A00479