Nibco B258500 Cast Copper Union 1/4 in C X F

Product Description

The NIBCO B258500 is a cast copper pipe union designed for pressure fitting applications in copper piping systems. It features a C x F (sweat x female) end connection, allowing a soldered joint on one side and a threaded female connection on the other. Sized at 1/4 inch, this union is suited for low-volume or instrument line applications where a separable, rebuildable joint is needed without cutting into the line. Licensed plumbers and pipefitters install this fitting in residential and light commercial systems where periodic disconnection of a copper run is required.

This union is appropriate for residential plumbing, hydronic heating distribution lines, and other copper pressure systems where a demountable joint is specified. The C x F configuration makes it a practical choice when transitioning between a soldered copper run and a threaded component such as a valve, gauge, or equipment connection. It is sold individually and is intended for professional installation in code-compliant copper pressure piping assemblies.

Key Features

• Cast copper construction for reliable performance in copper pressure systems
• C x F end connection supports sweat-to-female-thread transitions
• Pressure fitting style rated for use in pressurized copper lines
• 1/4 inch fitting size suited for instrument, control, or small-branch applications
• Rebuildable union design allows line separation without cutting pipe

Compatibility

Designed as an OEM-style replacement and standard-fit union for 1/4 inch copper pressure piping systems using sweat and female threaded end connections.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and the International Plumbing Code (IPC). Shut off and depressurize the system and allow all lines to cool completely before beginning work. The sweat end requires proper flux application and a clean, deburred pipe surface prior to soldering. Do not overtighten the union nut on the female threaded side; use an appropriate thread sealant compatible with copper fittings.