Sigma 819900846 Fig 3124 Pipe Cap 3 Inch Fnpt 150 Lb

Product Description

The SIGMA 819900846 is a FIG 3124 malleable iron pipe cap designed to close off the end of a threaded pipe run. Rated at 150 lb, this cap features a female NPT (FNPT) end connection and a hot-dip galvanized finish that resists corrosion in wet or outdoor environments. Sized for 3-inch nominal pipe, it is a standard fitting used in low-pressure piping systems for gas, water, air, and steam service. Licensed plumbers and pipefitters install these fittings during new construction, system modifications, or temporary line isolation.

This pipe cap is suited for residential and light commercial plumbing, gas distribution, compressed air, and hydronic heating applications where a 3-inch threaded termination is required. The galvanized coating makes it appropriate for exposed or damp locations where bare iron would be prone to rust. It is a domestically produced fitting conforming to standard malleable iron pipe fitting dimensions.

Key Features

• 3-inch nominal size closes standard threaded pipe ends cleanly
• FNPT end style threads directly onto male-threaded pipe or nipple
• 150 lb pressure rating suitable for low-pressure water, air, gas, and steam service
• Malleable iron construction provides strength and impact resistance over cast iron
• Galvanized finish resists corrosion in wet and outdoor installations
• Domestically produced fitting for projects requiring domestic-origin components

Compatibility

Designed as an OEM-style replacement or standard fitting for 3-inch FNPT threaded piping systems using 150 lb malleable iron fittings.

Installation Notes

Installation is performed by a licensed plumber or pipefitter. Shut off and depressurize the line completely before removing any existing fitting or installing this cap. Apply an approved pipe thread sealant or PTFE tape to the male threads before engagement, and tighten with a properly sized pipe wrench. Follow applicable code requirements under the IPC or IFGC depending on the service medium.

Technical Specifications

• Figure Number: FIG 3124
• Nominal Size: 3 inches
• End Style: FNPT (Female National Pipe Thread)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Origin: Domestic

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 819900846