Sigma 819900606 Malleable Iron Pipe Cap 1 in Fnpt 150 Lb

Product Description

The SIGMA 819900606 is a malleable iron pipe cap with a female NPT (FNPT) end style, rated for 150 lb service. It is designed to close off the end of a threaded pipe run in plumbing, mechanical, and industrial piping systems. The galvanized finish provides corrosion resistance for use in exposed or moderately harsh environments. Sized at 1 inch nominal, this cap threads directly onto the male end of a pipe to seal the line against pressure or to cap unused branch connections. Licensed plumbers, pipefitters, and mechanical contractors typically install this fitting during new construction, system modifications, or piping repairs.

This pipe cap is suited for residential and commercial plumbing, fire protection, and general industrial pipe work where a 150 lb malleable iron threaded fitting is required. It performs well in water, air, and low-pressure steam applications that call for a standard NPT threaded closure. The galvanized coating makes it a practical choice where some moisture exposure is expected. It is commonly used to terminate unused outlets, cap test ports, or seal branch lines during phased construction.

Key Features

• 1 inch nominal size fits standard 1 inch male NPT threaded pipe ends
• FNPT end style for straightforward wrench-tightened installation
• 150 lb pressure rating suits a wide range of low-to-medium pressure service applications
• Malleable iron construction provides durability and thread integrity under torque
• Galvanized finish offers corrosion resistance in wet or outdoor-adjacent environments

Compatibility

Designed as an OEM-style replacement or standard fitting for 1 inch nominal threaded pipe systems using 150 lb malleable iron fittings with NPT connections.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC and IFGC code requirements for the service type. Shut off and depressurize the pipe system fully before removing or installing any threaded cap. Apply appropriate thread sealant or PTFE tape to the male pipe threads before threading the cap on by hand, then tighten with a pipe wrench to achieve a leak-free seal. Do not over-torque, as this can crack the fitting or damage threads.

Technical Specifications

• Nominal Size: 1 inch
• End Style: FNPT (Female NPT)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized
• Figure Number: FIG 3124

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 819900606