Nibco B305456 Cast Copper Companion Flange 1-1/2 in

Product Description

The NIBCO B305456 is a cast copper companion pipe flange designed for use in pressure piping systems where reliable, leak-free connections are required at termination or transition points. Rated at 125 psi, this flange fits 1-1/2 inch pipe and measures 5 inches in outer diameter, with bolt hole centers spanning 3-7/8 inches across. The end connection type is C (solder cup), making it compatible with standard copper sweat installation practices. At 1.76 pounds, it is a solid, durable fitting appropriate for plumbing, HVAC hydronic piping, and mechanical system installations. Licensed plumbers and pipefitters are the typical installing trade.

This flange is suited for residential and light commercial piping applications where copper is the system material of choice. It functions as a companion flange, meaning it is used in pairs to create a bolted flange connection between two sections of copper pipe or between a copper line and equipment with a matching flange face. Typical install scenarios include hydronic heating and cooling systems, domestic water distribution, and mechanical room piping where accessible flanged joints are needed for serviceability. Fabricated to ASTM B584 standards, it is appropriate for wet service and general pressure piping use.

Key Features

• 125 psi pressure class suitable for standard plumbing and hydronic applications
• C (solder cup) end connection for copper sweat installation
• Cast copper construction per ASTM B584 for corrosion resistance in wet service
• 3-7/8 inch bolt hole circle for standard companion flange bolt pattern alignment
• 5 inch outer diameter on a 1-1/2 inch nominal pipe size fitting
• Companion style designed to be used in matched pairs for bolted flange joints

Compatibility

Designed as an OEM-style replacement or new-installation companion flange for 1-1/2 inch nominal copper pipe systems, compatible with matching 125 psi class companion flanges sharing the same bolt hole circle and face dimensions.

Installation Notes

Installation is performed by a licensed plumber or pipefitter. Shut off and depressurize the piping system and allow all lines to cool before beginning work. The C end connection requires standard copper sweat soldering technique with appropriate flux and solder meeting local plumbing code requirements. Bolt both companion flanges evenly in a cross-pattern sequence to ensure uniform gasket compression and a leak-free joint.