Asc Engineered Solutions 1B.NP Square Head Plug 1-1/4 in Mnpt

Product Description

The ASC Engineered Solutions 1B.NP is a cored regular square head plug designed for threaded pipe systems in plumbing, mechanical, and industrial piping applications. It features a 1-1/4 inch nominal size with a male NPT (MNPT) end style, allowing it to thread directly into a female-threaded pipe fitting or outlet. Constructed from cast iron with a galvanized finish, this plug provides corrosion resistance suited to wet and humid environments. Rated at 125 lb, it is appropriate for low-pressure water and gas distribution systems commonly found in commercial and residential mechanical installations. The cored design reduces material weight while maintaining structural integrity at rated pressure.

This plug is used to cap or temporarily close off a female NPT threaded opening in a piping system during installation, testing, or system modifications. It is a standard fitting for plumbers, pipefitters, and mechanical contractors working on water supply, drainage, and low-pressure gas piping. The galvanized cast iron construction makes it suitable for above-grade interior piping and light industrial environments where moderate corrosion resistance is required.

Key Features

• 1-1/4 inch nominal MNPT thread for direct installation into female-threaded fittings
• 125 lb pressure class rating suitable for low-pressure water and gas systems
• Cast iron construction with galvanized finish for corrosion resistance
• Cored regular square head design for standard wrench engagement
• Domestically sourced fitting meeting common plumbing and mechanical installation standards

Compatibility

Designed as an OEM-style replacement or standard installation fitting for 1-1/4 inch female NPT threaded pipe outlets and fittings rated at 125 lb class in cast iron piping systems.

Installation Notes

Installation is performed by licensed plumbers or pipefitters using a standard pipe wrench sized for a square head plug. Apply an approved thread sealant or PTFE tape to the MNPT threads before installation to ensure a leak-free connection. Shut off system pressure and depressurize the line before installing or removing any threaded fittings. Verify that the fitting pressure class is compatible with the operating pressure of the system per applicable plumbing codes such as the IPC or IFGC.

Technical Specifications

• Nominal Size: 1-1/4 inches
• End Style: MNPT (Male National Pipe Thread)
• Pressure Class: 125 lb
• Material: Cast Iron
• Finish: Galvanized
• Head Style: Cored Regular Square Head
• Origin: Domestic

Standard Information

• Brand: ASC Engineered Solutions
• Manufacturer Part Number: 1B.NP