Sigma 818900698 Malleable Iron Pipe Cap 1-1/2 in Fnpt 150 Lb

Product Description

The SIGMA 818900698 is a standard malleable iron pipe cap conforming to FIG 3124 specifications. It features a female NPT (FNPT) end connection and carries a 150 lb pressure rating. The black oxide finish provides basic corrosion resistance for dry or low-moisture indoor piping applications. This cap is used to terminate the end of a threaded pipe run, sealing it against flow or pressure. Plumbers and pipefitters install this fitting in residential and commercial piping systems. The 1-1/2 inch nominal size suits a wide range of common distribution and utility piping configurations.

This pipe cap is suited for use in low-pressure gas, water, and general utility piping systems where threaded malleable iron fittings are specified. It is commonly installed during rough-in, system testing, or wherever a branch or run requires a permanent or temporary threaded termination. The black oxide finish is standard for interior applications in dry or mildly humid environments.

Key Features

• FNPT threaded connection for standard threaded pipe termination
• 150 lb pressure class rating for low-pressure piping service
• Malleable iron construction provides strength and thread integrity
• Black oxide finish for basic surface protection
• 1-1/2 inch nominal size fits common distribution piping runs
• FIG 3124 standard geometry for consistent fit with threaded fittings

Compatibility

Designed as an OEM-style replacement or standard fitting for 1-1/2 inch nominal threaded malleable iron piping systems rated at 150 lb class.

Installation Notes

Installation is performed by a licensed plumber or pipefitter. Shut off and depressurize the piping system fully before removing or installing any threaded fittings. Apply thread sealant or PTFE tape to the male threads before engaging the cap. Follow applicable IPC or IFGC requirements for fitting class and material suitability based on the fluid or gas being conveyed.

Technical Specifications

• Nominal Size: 1-1/2 inches
• End Style: FNPT (Female National Pipe Thread)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Black Oxide
• Figure Number: FIG 3124

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 818900698