Sigma 818907685 Hex Head Pipe Bushing 2x1.5in 150lb

Product Description

The SIGMA 818907685 is a standard hex head pipe bushing conforming to FIG 3383 dimensions, designed to reduce a 2-inch male NPT fitting down to a 1-1/2-inch female NPT port. Constructed from malleable iron with a black oxide finish, it carries a 150 lb pressure rating suitable for general-purpose piping systems. The hex head profile allows full wrench engagement for secure installation without slipping. Plumbers and pipefitters use this bushing when transitioning between pipe sizes in threaded iron piping assemblies in both commercial and residential applications.

This bushing fits standard threaded iron pipe systems where a size reduction from 2-inch to 1-1/2-inch is required. It is appropriate for use in water distribution, low-pressure steam, hydronic heating, and general industrial piping. The MNPT x FNPT end configuration allows the bushing to thread into a female-threaded fitting or valve body while accepting a male-threaded pipe or fitting on the outlet side. It is a common component in mechanical rooms, boiler rooms, and fire protection piping where malleable iron fittings are specified.

Key Features

• 2-inch MNPT inlet threads down to 1-1/2-inch FNPT outlet for in-line pipe size reduction
• Malleable iron construction provides strength and resistance to mechanical stress in threaded assemblies
• Black oxide finish offers corrosion resistance appropriate for typical indoor piping environments
• Hex head profile allows full wrench engagement for leak-free thread makeup
• 150 lb pressure rating meets standard requirements for general-purpose threaded iron piping
• FIG 3383 standard dimensions ensure interchangeability with compatible malleable iron fittings

Compatibility

Designed as a standard FIG 3383 hex head pipe bushing for use in 150 lb malleable iron threaded piping systems with 2-inch MNPT and 1-1/2-inch FNPT connections.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter. Isolate and depressurize the piping system completely before removing or installing any threaded fittings. Apply an approved thread sealant or PTFE tape to the male threads before assembly and tighten to proper engagement using a pipe wrench on the hex head. Do not overtighten, as malleable iron threads can crack under excessive torque.

Technical Specifications

• Nominal Size: 2 x 1-1/2 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: 818907685