Sigma 33C 1020C Malleable Iron Pipe Cap 2 in Fnpt 150 Lb

Product Description

The SIGMA 33C 1020C is a 2-inch nominal malleable iron pipe cap with a female National Pipe Taper (FNPT) end style, rated at 150 lb. Pipe caps are threaded fittings used to close off the end of a pipe run, preventing flow and sealing the system during testing, repair, or permanent termination. This fitting is finished in black and is designed for use by licensed plumbers, pipefitters, and mechanical contractors working on low-pressure piping systems. The 150 lb pressure class and malleable iron construction make it suitable for steam, water, gas, and air distribution applications commonly found in commercial and industrial settings.

This pipe cap is used in threaded piping assemblies where a permanent or serviceable end closure is needed. Typical applications include dead-end branch lines, pressure testing setups, and system shutoffs in mechanical rooms, industrial plants, and commercial buildings. The FNPT thread engages standard NPT-threaded pipe ends, making it compatible with common schedule 40 black iron pipe used in gas and steam distribution systems.

Key Features

• 2-inch nominal FNPT thread for standard NPT pipe compatibility
• 150 lb pressure class rated for steam, water, gas, and air service
• Malleable iron construction provides strength and resistance to impact and vibration
• Black finish standard for gas and steam piping applications
• Threaded end style allows hand-start installation and tool-tightened seal

Compatibility

Designed as an OEM-style replacement and standard fitting for 2-inch NPT threaded malleable iron piping systems rated at 150 lb class.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable codes such as the International Plumbing Code (IPC) or International Fuel Gas Code (IFGC). Shut off system pressure and depressurize the line before installing or removing any threaded fitting. Apply an appropriate thread sealant or PTFE tape to the male pipe threads before engaging the cap. Tighten with a pipe wrench to achieve a leak-free seal without overtightening, which can crack the fitting.

Technical Specifications

• Nominal Size: 2 inches
• End Style: FNPT (Female National Pipe Taper)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Black

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 33C 1020C