3/8 inch x 1/4 inch Brass Compression Reducing Union Compression x Compression

3/8OD x 1/4OD Lead-Free Brass Compression Union – Precision Connection in Compact Spaces

The 3/8OD x 1/4OD Lead-Free Brass Compression Union is engineered for reliable, code-compliant connections where dimensional transitions are needed. Manufactured from corrosion-resistant, lead-free brass, this union ensures mechanical integrity and sealing performance in constrained routing applications.

Its dual-compression configuration allows for quick assembly without soldering, making it suitable for a range of low- to moderate-pressure systems involving potable water, air, or inert gases. Precision-machined surfaces and uniform wall thickness provide a robust seal, supporting long-term performance under typical residential and light commercial operating conditions.

Product Advantages

• ✅ Lead-Free Brass Construction – Conforms to federal low-lead requirements, safe for potable water use.
• ✅ Dual Compression Ends – Enables secure transitions between 3/8 inch and 1/4 inch OD tubing.
• ✅ Corrosion Resistance – Resists dezincification and provides long service life in typical plumbing environments.
• ✅ No Heat Required – Installation does not require soldering, making it ideal for use in finished assemblies or confined spaces.
• ✅ Reusable Design – Disassembly and realignment are possible without damaging the fitting or tubing.

Specifications

• Material: Lead-Free Brass (compliant with NSF 61-G and NSF 372)
• Connection Type: Compression x Compression
• Sizes: 3/8” OD x 1/4” OD
• Operating Pressure: Typically up to 200 PSI for water (verify per local code)
• Temperature Rating: Suitable for standard cold and hot water systems

Applications

This compression union is typically used in residential potable water lines, equipment connections, and retrofit scenarios where traditional soldering is impractical. Ideal for shut-off valve transitions, water filtration installations, and appliance hookups.

Installation Considerations

Proper cutting and deburring of tubing ends is essential to ensure a uniform seal. Tighten using appropriately sized wrenches, and avoid overtightening which may deform ferrules or crush tubing. Use of pipe dope or Teflon tape is not required on compression threads and may interfere with performance if improperly applied.

Note

Always verify material compatibility and local plumbing codes before installation. This union is not intended for use with soft plastic tubing unless supported with internal inserts as approved by code.