Sigma 811081405 Galvanized Malleable Iron Coupling 2.5 in

Product Description

The SIGMA 811081405 is a galvanized malleable iron pipe coupling sized for 2.5-inch nominal pipe. It provides a threaded, inline connection between two sections of pipe, maintaining a continuous run in piping systems. Malleable iron construction delivers the ductility and strength needed for mechanical and plumbing installations where a rigid cast fitting would be too brittle. The galvanized finish adds corrosion resistance, making this coupling suitable for wet or exposed environments. Plumbers, pipefitters, and mechanical contractors install this type of fitting on threaded pipe runs during new construction and retrofit work.

This coupling is used in residential and commercial piping systems where 2.5-inch threaded pipe connections are required. Typical applications include water supply distribution, gas piping, fire protection headers, and general mechanical piping. The galvanized coating makes it a common choice in outdoor, underground-adjacent, or high-humidity service environments where bare iron fittings would corrode prematurely.

Key Features

• 2.5-inch nominal size for standard threaded pipe runs
• Malleable iron construction provides ductility and impact resistance over brittle cast iron
• Galvanized finish for corrosion resistance in wet or exposed installations
• Threaded interior accepts standard NPT pipe ends for a secure mechanical connection

Compatibility

Designed as an OEM-style replacement and standard-service fitting for 2.5-inch nominal threaded malleable iron piping systems.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and the International Plumbing Code or International Fuel Gas Code where relevant. Shut off and depressurize the pipe system completely before removing or installing any threaded fitting. Apply an approved thread sealant or PTFE tape to male threads before making up the joint. Do not over-tighten, as malleable iron threads can be damaged by excessive torque.

Technical Specifications

• Nominal Size: 2.5 inches
• Material: Malleable Iron
• Finish: Galvanized
• Fitting Type: Coupling

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 811081405