Sigma 819902412 Square Head Plug 3/4 in Mnpt 150 Lb Galvanized

Product Description

The SIGMA 819902412 is a cored square head plug designed for use in threaded pipe systems requiring a removable closure. The plug features a male NPT (MNPT) end style for direct engagement with female-threaded fittings and is rated at 150 lb, making it suitable for standard-pressure piping applications. Constructed from malleable iron with a galvanized finish, this plug resists corrosion in exposed or moderately harsh environments. It is sized at 3/4 inch nominal and is typically installed by plumbers, pipefitters, and mechanical contractors during system construction, pressure testing, or where future access points are needed.

This cored square head plug is used in residential and commercial piping systems where a temporary or permanent threaded closure is required. The square head drive allows removal or installation using a standard wrench or socket, which is common practice when plugging branch outlets, test ports, and drain taps in water, gas, and steam distribution lines rated within the 150 lb class.

Key Features

• 3/4 inch nominal size with MNPT end style for standard threaded fitment
• 150 lb pressure class rating suitable for standard-service piping
• Malleable iron construction provides strength and impact resistance
• Galvanized finish adds corrosion protection for extended service life
• Square head drive allows installation and removal with common hand tools
• Cored design consistent with Class 3111 malleable iron pipe fitting standards

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 3/4 inch female NPT threaded pipe connections in 150 lb class malleable iron piping systems.

Installation Notes

Installation is performed by licensed plumbers or pipefitters in accordance with applicable mechanical and plumbing codes such as the IPC or IFGC. Shut off and depressurize the piping system completely before removing or installing any threaded plug. Apply an appropriate thread sealant or PTFE tape to the male threads before engagement. Do not overtighten, as malleable iron fittings can crack under excessive torque.

Technical Specifications

• Nominal Size: 3/4 inch
• End Style: MNPT (Male National Pipe Thread)
• Pressure Rating: 150 lb
• Material: Malleable Iron
• Finish: Galvanized

Standard Information

• Brand: SIGMA
• Manufacturer Part Number: 819902412