Sigma 810080812 Malleable Iron Pipe Coupling 1-1/4 in Fnpt 150 Lb

Product Description

The SIGMA 810080812 is a FIG 3121 malleable iron pipe coupling designed for threaded pipe assembly in plumbing, HVAC, and mechanical piping systems. It features female National Pipe Taper (FNPT) threads on both ends and is rated at 150 lb working pressure. The black oxide finish provides a degree of corrosion resistance suited for dry and low-moisture indoor environments. This coupling is sized for 1-1/4 inch nominal pipe and is installed by licensed plumbers, pipefitters, and mechanical contractors working on gas, water, and steam distribution systems.

This coupling is appropriate for residential and light commercial piping applications where threaded malleable iron fittings are specified. Common install scenarios include natural gas distribution, hydronic heating supply and return lines, compressed air distribution, and general-purpose water piping. The 150 lb pressure rating makes it suitable for standard-service threaded pipe runs in accordance with applicable mechanical and plumbing codes.

Key Features

• FIG 3121 full coupling with FNPT threads on both ends for inline pipe joining
• 1-1/4 inch nominal pipe size for standard Schedule 40 threaded pipe
• 150 lb pressure rating for standard-service plumbing and mechanical piping
• Malleable iron construction offers strength and impact resistance over cast iron
• Black oxide finish for identification and light surface protection in indoor applications

Compatibility

Designed as an OEM-style threaded fitting for use with 1-1/4 inch nominal Schedule 40 threaded pipe in standard 150 lb malleable iron fitting systems.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in compliance with the International Plumbing Code (IPC) or International Fuel Gas Code (IFGC) as applicable. Shut off and depressurize the pipe system before removing or installing any fitting. Apply appropriate thread sealant or PTFE tape to male threads before makeup. Do not use this fitting in applications that exceed its 150 lb pressure rating or in systems requiring a higher-rated fitting per code.

Technical Specifications

• Figure Number: FIG 3121
• Nominal Pipe Size: 1-1/4 inches
• End Style: FNPT (Female National Pipe Taper) both ends
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Black Oxide

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 810080812