3/8 inch Compression Brass Flared Cap

3/8" OD Brass Flared Cap – Compression End Closure for Flared Tube Systems

The 3/8" OD Brass Flared Cap is a threaded compression fitting designed to seal the end of a flared copper or aluminum tubing line. Precision-machined to accommodate 3/8" outer diameter tubing, this cap is typically used in refrigeration, gas, fuel oil, and water service applications where a mechanical seal is required without soldering.

Manufactured from lead-free brass per ANSI and ASTM material specifications, this component is corrosion-resistant and capable of withstanding mechanical vibration and moderate thermal fluctuation. It is suitable for use in both residential and commercial systems where disassembly or service access may be required.

Key Performance Attributes

• ✅ Material: Lead-free brass conforming to ASTM B16/B453
• ✅ Connection Type: 45° flare cap for 3/8" OD tubing (not pipe thread)
• ✅ Application: Non-permanent tube closure in low- to moderate-pressure fluid and gas systems
• ✅ Compliance: Meets NSF/ANSI 61 and 372 for potable water applications
• ✅ Temperature Range: Suitable for use from -65°F to 250°F, depending on system parameters

Installation Guidelines

Install by tightening the cap onto an existing flared tube end using an appropriate flare nut wrench. No additional sealant or tape is required, as the 45° flare provides the sealing surface. Ensure the mating flare face is clean and free of deformation. Over-tightening may damage the tubing flare or distort the seat, leading to leaks.

Common Applications

This fitting is used in systems requiring removable or serviceable terminations, including fuel line shutoffs, appliance gas connections, HVAC equipment, and water service systems. It is especially suited for applications where mechanical disconnection may be necessary for inspection, pressure testing, or seasonal service.

Material Note

Brass provides excellent machinability, corrosion resistance, and compatibility with copper, aluminum, or steel tubing. The lead-free formulation ensures suitability for potable water systems in compliance with the Safe Drinking Water Act (SDWA).

The 3/8" OD Brass Flared Cap delivers secure, leak-resistant termination in flared tubing systems. Its standardized geometry and material reliability make it a trusted component in both new installations and field service applications where durability and repeatability are required.