Bk Mueller 521-963HN Black Iron Bushing 1-1/4x1/2 Threaded

Product Description

The BK MUELLER 521-963HN is a threaded black malleable iron bushing designed to reduce a 1-1/4 inch pipe connection down to a 1/2 inch fitting. Built to Class 150 standards with a 300 psi pressure rating, this bushing handles both liquid and gas service in standard piping systems. The black finish is achieved through a hot-dip or oil-coat process typical of malleable iron fittings, providing basic corrosion resistance for interior applications. Plumbers and pipefitters install this type of bushing when transitioning between pipe sizes in gas distribution lines, water supply systems, or compressed air headers.

This bushing is suited for residential and light commercial piping applications where a threaded reducer is needed between 1-1/4 inch and 1/2 inch connections. Common install scenarios include natural gas branch lines, propane distribution, and general-purpose plumbing assemblies where NPT threaded fittings are standard. The malleable iron construction tolerates the vibration and minor mechanical stress common in mechanical room and utility installations.

Key Features

• Malleable iron construction rated for threaded pipe service
• Class 150 fitting with 300 psi liquid and gas pressure rating
• Reduces 1-1/4 inch to 1/2 inch pipe connections
• Black finish suitable for gas and water interior piping
• NPT threaded end connections on both ends

Compatibility

Designed as an OEM-style replacement or new-installation fitting for threaded malleable iron piping systems using 1-1/4 inch by 1/2 inch NPT connections.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and IFGC or IPC requirements. Shut off and depressurize the line before removing or installing any fitting. Apply an approved pipe thread sealant or PTFE tape rated for the service medium before threading the bushing into place. Do not overtighten; hand-tight plus wrench turns per fitting manufacturer guidance is standard practice for malleable iron NPT fittings.