Nibco B305256 Cast Copper Companion Pipe Flange

Product Description

The NIBCO B305256 is a cast copper companion pipe flange rated for 125 psi service. It is designed to connect sections of copper piping using a companion flange pairing, creating a bolted joint that allows for easy disassembly and maintenance. This flange fits a 1/2 inch pipe size and has an outer diameter of 3-1/2 inches with bolt hole centers spaced 2-3/8 inches apart. The end connection type is C (sweat), making it compatible with standard copper soldering practices. It is installed by licensed plumbers and pipefitters in both commercial and residential plumbing systems.

This flange is suited for low-pressure plumbing and hydronic systems where copper piping is the specified material. The companion style means it is paired with a matching flange on an adjoining pipe or fitting, bolted together to form a removable joint. Typical applications include water distribution, heating systems, and other fluid-handling installations where copper is required by specification or code. The sweat end connection requires standard torch soldering with appropriate copper flux and solder.

Key Features

• Cast copper construction meets ASTM B584 standard for copper alloy sand castings
• Rated to 125 psi for reliable low-pressure service
• Sweat (C) end connection for standard copper soldering installation
• Companion flange style allows bolted, removable pipe joints
• 1/2 inch pipe size with 3-1/2 inch OD and 2-3/8 inch bolt hole center spacing

Compatibility

Designed as an OEM-style replacement or new-installation companion flange for 1/2 inch copper piping systems rated at Class 125 with sweat end connections.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable plumbing codes, including the IPC. Shut off the water supply and depressurize the system completely before beginning any soldering or flange work. Clean and flux all mating copper surfaces prior to soldering the sweat connection. Ensure the companion flange and its paired flange are properly aligned before torquing fasteners to avoid stress on the joint.