1/2 inch OD x 3/8 inch OD Brass Reducing Flared Union Flare x Flare

1/2 inch OD x 3/8 inch OD Brass Reducing Flared Union – Lead-Free, Precision Machined

The 1/2 inch OD x 3/8 inch OD reducing flared union is a two-piece brass fitting used to join dissimilar-sized copper tubing in fluid or gas service lines. Engineered for use in flared systems, it provides a mechanical seal without the need for soldering or threading. This configuration is suitable for applications requiring disconnection or maintenance access.

Constructed from lead-free brass, this union meets federal and state plumbing codes for potable water systems. The flared connections are machined to industry-standard 45° specifications, ensuring compatibility with copper tubing conforming to ASTM B88 and ASME B16.26.

Performance Characteristics

• ✅ Connection Type: 45° Flare x 45° Flare (reducing)
• ✅ Material: Lead-free brass alloy (compliant with NSF/ANSI 61 and 372)
• ✅ Pressure Rating: Suitable for service pressures up to 200 psi (varies by system and tubing used)
• ✅ Temperature Range: Operating range -65°F to 250°F (with copper tubing)
• ✅ Application Scope: Designed for use in fuel gas, refrigeration, potable water, and hydraulic control lines

Technical Specifications

• Inlet: 1/2 inch OD copper flare
• Outlet: 3/8 inch OD copper flare
• Configuration: Reducing union, double flare nut assembly
• Standard Compliance: ASME B16.26, ANSI/NSF 61 & 372, ASTM B16/B453

Installation Considerations

This fitting requires flared copper tubing. Flare ends must be properly prepared using a 45° flaring tool to ensure a full-face seal. Wrenches should be used to tighten the nut and body securely, taking care not to overtighten, which may deform the tubing flare. Sealants are not used on flared joints; the mechanical seal is achieved by the metal-to-metal contact.

Typical Use Cases

Reducing flare unions are commonly used in applications such as appliance installations, fuel distribution manifolds, water supply transitions, or instrumentation setups where two tubing sizes must be joined while preserving a detachable connection.

Material Note

Brass is selected for its corrosion resistance, machinability, and thermal stability. Lead-free formulations allow safe use in systems handling potable water without compromising performance in mechanical or fuel applications.