Sigma 818907446 Hex Head Pipe Bushing 1-1/2x1 in 150 Lb

Product Description

The SIGMA 818907446 is a standard hex head pipe bushing conforming to FIG 3383 specifications, designed to reduce a 1-1/2 inch male NPT pipe thread to a 1 inch female NPT thread. Constructed from malleable iron with a black oxide finish, this bushing provides reliable, corrosion-resistant connections in low-pressure piping systems. Rated at 150 lb, it is suited for use in steam, water, gas, and oil distribution lines. Licensed plumbers and pipefitters install this fitting wherever a threaded reduction is required between mismatched pipe sizes in standard pressure service.

This hex head bushing is used in residential and light commercial plumbing, HVAC piping, fire protection, and industrial process piping applications. The external hex profile allows installation and removal with a standard open-end or adjustable wrench, making it practical in tight spaces. It is appropriate for use in black iron gas piping assemblies, hydronic heating distribution systems, and general-purpose threaded pipe networks where a concentric, in-line reduction is needed.

Key Features

• FIG 3383 standard hex head bushing design for concentric in-line pipe reduction
• 1-1/2 inch MNPT x 1 inch FNPT thread configuration
• 150 lb pressure rating suitable for steam, water, gas, and oil service
• Malleable iron construction for strength and impact resistance in threaded assemblies
• Black oxide finish for corrosion resistance in standard service environments
• Hex head profile accepts open-end or adjustable wrench for reliable torque application

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard 150 lb malleable iron threaded pipe systems using 1-1/2 inch to 1 inch NPT reductions.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and the International Plumbing Code or International Fuel Gas Code where relevant. Shut off and depressurize the system fully before disassembling or installing any threaded pipe fitting. Apply an approved thread sealant or PTFE tape to the male threads before assembly. Do not over-tighten; use a wrench on the hex head rather than applying force to connected pipe sections.

Technical Specifications

• Nominal Size: 1-1/2 x 1 inches
• End Style: MNPT x FNPT
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Black Oxide
• Figure: FIG 3383

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 818907446