Nibco B255450 Cast Copper Union 5/8 Inch C X C

Product Description

The NIBCO B255450 is a cast copper pipe union designed for sweat-connect (C x C) pressure piping systems. It allows technicians to disconnect and reconnect sections of copper piping without cutting, making it a practical component in both new construction and service work. Sized at 5/8 inch, it is well suited for residential and light commercial plumbing and hydronic heating lines. The union is manufactured from cast copper, providing reliable corrosion resistance and compatibility with standard soldering procedures. Licensed plumbers and HVAC technicians working on copper distribution systems are the primary installers of this fitting.

This fitting is used in residential and light commercial applications where a serviceable joint is needed in a copper sweat pressure system. Common install scenarios include water supply lines, hydronic heating loops, and refrigeration-adjacent piping where copper is the specified material. The C x C end connection accepts standard copper tubing and is joined using conventional solder or brazing technique. Its compact cast copper construction makes it appropriate for tight mechanical spaces.

Key Features

• Cast copper construction provides corrosion resistance and long service life in wet piping environments
• C x C (sweat) end connections are compatible with standard copper tubing and soldering procedure
• Union design allows the piping section to be disconnected and reconnected without cutting the line
• 5/8 inch fitting size suits a common residential and light commercial pipe dimension
• Pressure fitting rated for use in pressurized water and hydronic systems

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 5/8 inch copper sweat pressure piping systems using C x C end connections.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician in accordance with local plumbing codes and IPC guidelines. Shut off and depressurize the water or fluid system completely before cutting into any existing line or disassembling a union. Clean and flux all mating surfaces before soldering, and allow the joint to cool fully before restoring system pressure. Do not overtighten the union nut, as cast copper fittings can crack under excessive mechanical force.