Nibco B305756 Cast Copper Companion Pipe Flange 5 in

Product Description

The NIBCO B305756 is a cast copper companion pipe flange rated for 125 psi service, designed for use in pressure piping systems where a reliable, leak-free flange connection is required. With a 5-inch pipe size and a 10-inch outer diameter, this flange pairs with a mating flange to create a bolted joint in copper piping assemblies. The C end connection style accommodates soldered or brazed copper pipe installations. Weighing 9.04 pounds, the B305756 is a substantial, heavy-duty component built for long-term service in commercial and industrial plumbing applications. Licensed plumbers and pipefitters are the primary installers for this type of fitting.

This companion flange is suited for commercial and industrial piping systems where copper is the specified material and flanged connections are required at equipment, valves, or system transitions. The 8-1/2-inch across-bolt-hole-center dimension governs bolt circle layout during assembly. Its 125 psi pressure rating makes it appropriate for moderate-pressure water, hydronic, and general plumbing service. It is typically installed in mechanical rooms, boiler rooms, and process piping where flanged copper connections are called out by the design engineer or code requirement.

Key Features

• Cast copper construction for corrosion resistance in copper piping systems
• 125 psi pressure rating suitable for moderate-pressure commercial service
• C end connection style for soldered or brazed copper pipe joining
• 10-inch outer diameter with 8-1/2-inch across-bolt-hole-center dimension for standard bolt circle layout
• Companion (mating) flange style for bolted joint assembly
• 9.04-pound solid cast construction for long-term mechanical integrity

Compatibility

Designed as an OEM-style replacement and standard companion flange for 5-inch copper pipe systems using C-style end connections rated to 125 psi.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable plumbing codes such as the IPC or local authority having jurisdiction. Depressurize and drain the system fully before removing any existing flange or beginning solder and braze work on the C end connection. Verify bolt circle alignment using the 8-1/2-inch across-bolt-hole-center dimension before torquing fasteners. Use appropriate flange gaskets and hardware rated for the system operating pressure.