Bk Mueller 511-364HC Malleable Iron Reducing Coupling

Product Description

The BK MUELLER 511-364HC is a malleable iron reducing coupling designed to connect pipes of two different diameters using threaded end connections. It steps down from a 1-1/4 inch line to a 3/4 inch line and is rated for 300 psi on liquid and gas service and 150 psi on steam service. The Class 150 galvanized finish provides corrosion resistance in wet or exposed piping environments. This fitting is a standard workhorse for plumbers and pipefitters installing or modifying threaded iron pipe systems in commercial and residential applications.

This reducing coupling is suited for gas distribution lines, water supply systems, steam piping, and general industrial fluid handling where a threaded iron fitting is required. The galvanized coating makes it appropriate for mildly corrosive environments or installations where moisture contact is expected. Plumbers and mechanical contractors typically use this fitting during new construction, system retrofits, or repairs where pipe diameter changes occur within a threaded piping run.

Key Features

• Reduces from 1-1/4 inch to 3/4 inch in a single threaded fitting
• Rated 300 psi for liquid and gas service
• Rated 150 psi for steam service
• Class 150 malleable iron construction for strength and machinability
• Galvanized finish for added corrosion resistance
• Threaded end connections for tool-only assembly with no welding required

Compatibility

Designed as an OEM-style replacement or standard-fit component for Class 150 threaded malleable iron pipe systems carrying gas, liquid, or low-pressure steam.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter following applicable local codes, including IFGC requirements for gas piping or IPC requirements for water and steam systems. Shut off and depressurize the line completely before disassembling any fitting. Apply appropriate thread sealant or PTFE tape to the male threads before assembly and tighten with a pipe wrench to a secure, leak-free connection. Do not over-torque malleable iron fittings, as the material can crack under excessive force.