3/8 inch Brass Coupling Female x Female

3/8 Inch Brass Coupling – Female x Female for Threaded Connections

This 3/8 inch brass coupling with dual female National Pipe Thread (NPT) ends is engineered for joining two male-threaded 3/8 inch pipe or fittings in potable water, air, oil, or gas systems. Manufactured from lead-free brass compliant with ANSI/NSF standards, it offers mechanical integrity, corrosion resistance, and compatibility with a broad range of systems and materials.

Product Specifications

• Size: 3/8 inch nominal pipe size
• End Connections: FNPT x FNPT
• Material: C46500/C69300 Lead-Free Brass Alloy (meets Safe Drinking Water Act requirements)
• Operating Pressure: Up to 200 psi for water and oil; 125 psi for steam (non-shock)
• Temperature Range: -20°F to 400°F (depending on medium and sealing method)

Performance Characteristics

• Thread Integrity: Precision-cut tapered threads ensure consistent seal engagement in accordance with ANSI B1.20.1 standards.
• Corrosion Resistance: Brass construction resists dezincification, pitting, and stress corrosion cracking, particularly in potable water systems.
• Mechanical Strength: Suitable for medium-duty service in both vertical and horizontal pipe runs.
• Code Compliance: Compliant with NSF/ANSI 61 and NSF 372 for low-lead content in drinking water applications.

Application Areas

This brass coupling is suitable for installation in a variety of systems including:

• Hot and cold potable water supply
• Compressed air lines
• Hydronic heating systems
• Low-pressure oil and fuel transfer systems

Installation Guidelines

Use PTFE tape or thread sealant approved for brass and the application medium. Avoid overtightening; a properly torqued NPT joint requires 2–3 full turns beyond hand-tight engagement. For potable water installations, verify material traceability to meet jobsite compliance documentation.

Note:

Brass fittings like this coupling are preferred for their ease of installation, reusability in certain applications, and broad temperature/pressure capabilities compared to thermoplastics or other metals.