Nibco B305806 Cast Copper Companion Pipe Flange 6 in

Product Description

The NIBCO B305806 is a cast copper companion pipe flange rated for 125 psi service, designed for use in plumbing and piping systems where copper flanged connections are required. It accepts a 6-inch pipe with an 11-inch outer diameter and features a C-end (solder cup) connection for direct copper joining. The bolt hole centers are spaced 9.5 inches across, conforming to standard flange bolt patterns. At 12.68 pounds, this is a substantial fitting suited for commercial and industrial copper piping installations. It is typically installed by licensed plumbers or pipefitters working on pressure piping systems.

This companion flange is used in applications requiring a bolted, flanged connection point in a copper piping system. Common installation scenarios include mechanical rooms, boiler rooms, pump stations, and large-scale commercial plumbing where flanged access points are needed for maintenance or equipment isolation. The companion style allows it to be paired with a mating flange and gasket to create a serviceable joint. It is appropriate for residential and commercial piping systems operating within its 125 psi pressure class.

Key Features

• Cast copper construction meets ASTM B584 standard for copper alloy sand castings
• Rated at 125 psi for reliable pressure service
• C-end (solder cup) connection for standard copper sweat joining
• 6-inch pipe size with 11-inch outer diameter flange face
• 9.5-inch bolt hole center spacing conforms to standard flange bolt patterns
• Companion flange style designed to mate with a corresponding flange and gasket

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 6-inch copper piping systems using Class 125 flanged connections with C-end solder cup entry.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC and local plumbing codes. Shut off and depressurize the piping system completely before cutting or joining any pipe. The solder cup connection requires proper flux application and lead-free solder per code requirements. Ensure mating flange, gasket, and fastener ratings are compatible with the 125 psi service class before torquing bolts.