Sigma 819908898 Hex Head Pipe Bushing 2x4 in 150lb Galvanized

Product Description

The SIGMA 819908898 is a hex head pipe bushing designed to reduce a 4-inch female NPT fitting down to a 2-inch male NPT connection. Built from malleable iron with a galvanized finish, this bushing handles standard 150 lb pressure-rated piping systems. The hex head profile allows for wrench installation, providing solid torque control during assembly. It is a common fitting for HVAC, plumbing, and fire protection piping where pipe size transitions are required. Licensed plumbers and pipefitters install this fitting in both new construction and retrofit work.

This bushing is suited for use in residential and commercial piping systems where a 4-inch line must transition to a 2-inch branch or connection point. Typical applications include water supply lines, gas distribution piping, and steam systems rated at 150 lb. The galvanized coating provides corrosion resistance in wet or outdoor-exposed environments. FIG 3383 references the standard hex head bushing pattern used across the industry.

Key Features

• Reduces 4-inch FNPT to 2-inch MNPT for straightforward pipe size transitions
• 150 lb pressure rating suitable for standard piping service
• Malleable iron construction provides durability and impact resistance
• Galvanized finish resists corrosion in wet or exposed installations
• Hex head design allows wrench engagement for secure, leak-free make-up
• FIG 3383 pattern for industry-standard fitment

Compatibility

Designed as an OEM-style replacement fitting for standard 150 lb malleable iron threaded piping systems using NPT connections.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC or IFGC requirements depending on the service. Shut off the water, gas, or steam supply and depressurize the line fully before disassembly or fitting installation. Apply thread sealant or PTFE tape to the male threads before makeup. Tighten with a pipe wrench to the hex flats — do not overtighten to the point of cracking the fitting body.

Technical Specifications

• Nominal Size: 2 x 4 inches
• End Style: MNPT x FNPT
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3383

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 819908898