Bk Mueller 520-433HP Black Iron Reducer 3/4x1/2 Threaded

Product Description

The BK MUELLER 520-433HP is a threaded black malleable iron reducer fitting designed to connect pipes of different diameters in gas and liquid piping systems. It transitions from a 3/4-inch inlet to a 1/2-inch outlet using standard threaded end connections. Rated at Class 150 with a pressure rating of 300 psi, this reducer handles the demands of commercial and residential black iron pipe installations. The black finish is standard for gas-service piping. Plumbers and pipefitters install this fitting in natural gas, propane, compressed air, and water distribution systems.

This reducer is suited for residential and light commercial applications where a pipe size reduction is required along a threaded black iron run. Typical uses include branch takeoffs, appliance drops, and service line reductions in gas piping systems. Its malleable iron construction makes it appropriate for systems subject to vibration or mechanical stress where a more ductile fitting material is preferred over cast iron.

Key Features

• Threaded end connections for tool-only installation without soldering or welding
• Malleable iron construction provides ductility and resistance to mechanical stress
• Black finish standard for gas-service piping identification
• Class 150 rated with a 300 psi liquid and gas pressure rating
• 3/4-inch to 1/2-inch reducing configuration for common pipe size transitions

Compatibility

Designed as an OEM-style replacement and standard fitting for threaded black iron pipe systems using NPT connections at Class 150 service ratings.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with local codes and IFGC or IPC requirements for the intended service. Shut off and depressurize the gas or fluid system completely before disassembling any piping. Apply an approved thread sealant or PTFE tape to male threads before assembly. Do not over-tighten threaded connections, as malleable iron fittings can crack under excessive torque.