3/8 inch OD Brass Flared Union Swivel Nut Female x Female

3/8 inch OD Brass Flared Union Swivel Nut – Built for Code-Compliant Fluid Connections

The 3/8 inch OD Brass Flared Union Swivel Nut is engineered for secure, high-integrity connections in fuel, water, and oil distribution lines. Designed to accommodate 37° flared tube ends, this fitting delivers a robust seal without requiring soldering, making it ideal for service applications that demand both precision and durability.

Manufactured from lead-free brass in compliance with federal Safe Drinking Water Act (SDWA) standards, this component is suitable for potable water systems as well as fuel gas installations where flare fittings are permitted by code. The swivel nut design allows for straightforward alignment and tightening in confined areas, improving installation efficiency without compromising connection strength.

Performance Features

• Material: No-lead brass (compliant with NSF/ANSI 372)
• Size: 3/8 inch Outside Diameter (OD)
• Connection Type: Flare x Flare (Female Swivel Nut)
• Flare Angle: 37° SAE standard
• Temperature Rating: -65°F to 250°F
• Pressure Rating: Up to 2000 PSI (when properly installed with compatible tubing)

Applications

Used extensively in:

• Water supply systems
• Natural gas and propane piping (where approved)
• HVAC systems
• Oil and fuel lines
• Instrumentation tubing connections

Installation Considerations

Ensure the use of compatible 3/8 inch OD flared copper or brass tubing. A properly prepared flare (per SAE J512 specifications) and the use of a calibrated torque wrench during final tightening help achieve optimal sealing performance. Do not use thread sealants on flare threads, as the seal is achieved at the mating flare surfaces.

Did You Know?

Flare fittings are preferred in high-pressure environments due to their ability to maintain mechanical integrity without deformation under torque—making them ideal for mission-critical piping assemblies.

The 3/8 inch OD Brass Flared Union Swivel Nut offers proven performance for demanding system installations. Its lead-free construction and SAE-compliant design make it a dependable choice for contractors who need code-approved, maintenance-friendly solutions in the field.