Bk Mueller 511-375HN Reducing Coupling 1-1/2 X 1 Inch

Product Description

The BK MUELLER 511-375HN is a galvanized malleable iron reducing coupling designed for connecting pipe of two different diameters in threaded piping systems. Rated at 300 psi for liquid and gas service and 150 psi for steam, this Class 150 fitting handles the pressure demands common in commercial and residential piping installations. The 1-1/2 inch by 1 inch size reduction allows a direct inline transition without additional adapters. Malleable iron construction provides the ductility and strength needed to withstand mechanical stress during installation and system operation. Licensed plumbers and pipefitters are the primary installers of this type of fitting.

This reducing coupling is suited for gas distribution lines, liquid supply piping, and steam systems where a pipe diameter reduction is required inline. The galvanized finish provides corrosion resistance in exposed or moderately wet environments. Threaded ends conform to standard NPT thread patterns, making this fitting compatible with standard Schedule 40 and Schedule 80 threaded pipe and fittings in plumbing, HVAC hydronic, and light industrial piping applications.

Key Features

• Galvanized malleable iron construction for corrosion resistance and mechanical durability
• Threaded ends for standard NPT connections on both the 1-1/2 inch and 1 inch ports
• 300 psi liquid and gas pressure rating
• 150 psi steam pressure rating
• Class 150 fitting rating for compatibility with standard commercial and residential piping systems
• Inline reducing design eliminates the need for separate reducer bushings in many applications

Compatibility

Designed as an OEM-style replacement and standard fitting for threaded malleable iron piping systems using 1-1/2 inch to 1 inch inline reductions in liquid, gas, or steam service.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or IFGC requirements. Shut off and depressurize the system fully before disassembling any threaded connections. Apply an approved pipe thread sealant or PTFE tape to male threads before assembly and tighten to a firm, leak-free engagement without over-torquing malleable iron fittings. Pressure-test the system after installation before returning it to service.