Sigma 819901018 Malleable Iron Galvanized Pipe Cap 4 in

Product Description

The SIGMA 819901018 is a 4-inch nominal malleable iron pipe cap with a hot-dip galvanized finish, designed to close off the end of a threaded pipe run. Malleable iron construction provides the ductility and strength required for mechanical and plumbing piping systems. The galvanized coating delivers corrosion resistance suitable for both indoor and outdoor installations. This fitting is installed by licensed plumbers and pipefitters working on water, gas, air, and general-purpose piping systems where a secure, threaded end closure is required.

This cap is suited for residential and commercial piping applications where a 4-inch nominal threaded pipe end must be capped and sealed. Common installation scenarios include dead-end service lines, pressure-test isolation points, and future-use branch stubs. The domestic manufacturing designation indicates the fitting is produced in the United States, which is relevant for projects with Buy American or domestic-content specifications.

Key Features

• 4-inch nominal size for use with standard 4-inch threaded pipe
• Malleable iron construction provides impact resistance and ductility over standard cast iron
• Galvanized finish provides corrosion protection for wet and outdoor environments
• Threaded end closure for straightforward installation with standard pipe wrenches
• Domestically manufactured for projects requiring domestic-content compliance

Compatibility

Designed as a standard threaded pipe cap for use with 4-inch nominal NPT-threaded malleable iron and steel pipe systems in plumbing, mechanical, and gas piping applications.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC and IFGC code requirements. Depressurize and isolate the pipe system before installing or removing any threaded fittings. Apply an approved pipe thread sealant or PTFE tape to the male threads before threading the cap on by hand, then tighten with a pipe wrench to achieve a leak-free connection. Do not overtighten malleable iron fittings, as excessive force can crack the fitting body.

Technical Specifications

• Nominal Size: 4 inches
• Material: Malleable Iron
• Finish: Galvanized
• Origin: Domestic (USA)

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 819901018