Nibco B258750 Cast Copper Union 3/4 in C X F

Product Description

The NIBCO B258750 is a cast copper pipe union designed for 3/4-inch copper tubing systems using a C x F (sweat by female) end connection. Unions allow a section of pipe or a component to be disconnected and removed without cutting the line, making them essential in systems that require periodic service access. This fitting meets ASME B16.18 and ASTM B584 standards, confirming material and dimensional compliance for pressure applications. Licensed plumbers and HVAC technicians install these fittings in both new construction and retrofit work wherever a serviceable break point is needed in a copper run.

This union is suited for residential and light commercial plumbing and hydronic heating systems where copper sweat connections are standard. The C x F configuration allows one side to be soldered directly to copper tubing while the female-threaded side accepts a corresponding male-threaded union component. It is commonly installed on water heaters, boilers, pumps, and other equipment connections that may require future removal or replacement without disturbing adjacent piping.

Key Features

• Cast copper construction meets ASTM B584 material standards
• Dimensionally compliant with ASME B16.18 for pressure fittings
• C x F end connection for sweat-to-threaded union assembly
• 3/4-inch fitting size for standard residential and commercial copper pipe runs
• Pressure-rated design suitable for potable water and hydronic applications

Compatibility

Designed as an OEM-style replacement and standard-grade fitting for 3/4-inch copper pipe systems requiring a sweat by female union connection in pressure service applications.

Installation Notes

Installation should be performed by a licensed plumber in accordance with the International Plumbing Code. Shut off the water supply and relieve system pressure before cutting into any existing line. Clean and flux all copper surfaces before soldering, and allow joints to cool completely before restoring pressure. Inspect the union seat and nut for proper seating before final tightening to prevent leaks.