Sigma 810088419 Malleable Iron Reducing Coupling 1.5x1 in

Product Description

The SIGMA 810088419 is a FIG 3121R malleable iron reducing coupling rated at 150 lb for threaded pipe assemblies. It connects a 1-1/2 inch nominal pipe to a 1 inch nominal pipe using female NPT (FNPT) threads on both ends. The black oxide finish provides a standard protective coating suited to low-pressure fluid and gas piping systems. Plumbers and pipefitters install this fitting in commercial and residential piping where reducing a pipe run from a larger diameter to a smaller diameter is required without additional adapters.

This reducing coupling is used in black iron piping systems for natural gas, steam, water, and general plumbing applications. The 150 lb pressure class makes it suitable for low-pressure service lines where standard malleable iron fittings are specified. It is a common component in mechanical rooms, industrial piping, and commercial gas distribution runs where diameter transitions are part of the system design.

Key Features

• Reduces 1-1/2 inch nominal pipe to 1 inch nominal pipe in a single fitting
• Female NPT (FNPT) threads on both ends for standard threaded pipe connection
• 150 lb pressure class malleable iron construction
• Black oxide finish for corrosion resistance in typical black iron piping applications
• FIG 3121R pattern — a widely recognized malleable iron reducing coupling configuration

Compatibility

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

Installation Notes

Installation is performed by licensed plumbers or pipefitters. Thread the fitting onto pipe ends using an approved pipe thread sealant or PTFE tape rated for the intended service medium. Always verify that the piping system is fully depressurized and isolated before removing or installing threaded fittings. Installations must comply with applicable local plumbing codes and IFGC requirements when used in gas service.

Technical Specifications

• Nominal Size: 1-1/2 x 1 inches
• End Style: FNPT (Female NPT) both ends
• Pressure Class: 150 lb
• Material: Malleable Iron
• Finish: Black Oxide
• Figure Number: FIG 3121R

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 810088419