Sigma 818907487 Hex Head Pipe Bushing 1.5x0.75 in Mnpt Fnpt 150lb

Product Description

The SIGMA 818907487 is a FIG 3383 standard hex head pipe bushing designed to reduce a 1-1/2 inch male NPT (MNPT) thread to a 3/4 inch female NPT (FNPT) thread. Rated at 150 lb, this bushing is constructed from malleable iron with a black oxide finish, providing corrosion resistance suitable for general-purpose piping systems. The hex head design allows for easy installation and removal with standard wrenches. It is a common fitting used by licensed plumbers and pipefitters working on low-pressure gas, water, and steam distribution systems in both residential and light commercial applications.

This bushing is suited for use in threaded pipe assemblies where a reduction in pipe size is required between two inline components. Typical installations include HVAC hydronic systems, gas distribution piping, compressed air lines, and general plumbing rough-in work. The MNPT x FNPT configuration allows it to thread directly into a female-threaded fitting or pipe outlet while accepting a smaller male-threaded pipe or fitting on the interior end.

Key Features

• 1-1/2 inch MNPT to 3/4 inch FNPT reducing configuration
• 150 lb pressure class rating for low-pressure piping service
• Malleable iron construction for durability in threaded pipe systems
• Black oxide finish for corrosion resistance in dry and moderate-moisture environments
• Hex head design for wrench engagement during installation and removal
• FIG 3383 standard geometry for compatibility with standard NPT threaded fittings

Compatibility

Designed as an OEM-style replacement or standard addition to threaded malleable iron pipe systems using NPT fittings rated at 150 lb class.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local plumbing and mechanical codes. Shut off and depressurize the system completely before removing or installing any threaded pipe fittings. Apply an appropriate thread sealant or PTFE tape to the male threads before assembly to ensure a leak-free joint. Do not over-torque, as malleable iron threads can crack under excessive force.