Nibco B259250 Cast Copper Union 2-1/2 in C X F

Product Description

The NIBCO B259250 is a cast copper pipe union designed for 2-1/2 inch pressure piping systems. It connects two sections of copper pipe using a C x F (sweat x female union) end configuration, allowing the joint to be broken and reassembled without cutting pipe. This union is built for pressure service in plumbing and mechanical systems where frequent or eventual disconnection is required. Weighing 3.66 pounds, it is a solid, full-weight fitting suited for demanding commercial and residential installations. Licensed plumbers and pipefitters are the typical installers for this size and fitting type.

This union is used in copper pressure piping installations across residential and light commercial plumbing, hydronic heating, and mechanical piping systems. The 2-1/2 inch size is common in main distribution lines, mechanical room headers, and building water service connections where serviceability is a design requirement. The C x F end connection means one end is soldered (sweat) and the other is a threaded female union nut, following standard union assembly practice.

Key Features

• Cast copper construction for durability in pressure piping service
• 2-1/2 inch fitting size for main distribution and mechanical piping applications
• C x F end connection allows sweat installation with a removable union joint
• Meets ASME B16.18 and ASTM B584 standards for cast copper alloy fittings
• Pressure fitting style rated for potable water and hydronic system use

Compatibility

Designed as an OEM-style replacement and standard-production union for 2-1/2 inch copper pressure piping systems conforming to ASME B16.18 dimensions.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and IPC guidelines. Depressurize and drain the system completely before cutting into any existing line. The sweat end requires proper flux application, a clean mating surface, and lead-free solder per local code requirements. Do not overtighten the union nut beyond hand-firm plus a controlled wrench turn, and always verify the joint for leaks before returning the system to service.