Asc Engineered Solutions 3.NP Square Head Plug 3 Inch Mnpt

Product Description

The ASC Engineered Solutions 3.NP is a cored regular square head plug used to terminate or cap threaded pipe ends in low-pressure plumbing, gas, and mechanical piping systems. Manufactured from cast iron with a galvanized finish, it features a male NPT (MNPT) end style sized at 3 inches nominal. The 125 lb pressure class rating makes it suitable for standard-service pipework. Licensed plumbers and pipefitters install this fitting during system assembly, pressure testing, or temporary line isolation. The galvanized coating provides corrosion resistance in exposed or damp environments.

This square head plug is used in residential and commercial plumbing, HVAC hydronic systems, and industrial piping where a reliable threaded pipe termination is required. The cored design distinguishes it from a solid plug, allowing for future tapping or line extension if needed. It is a domestically manufactured fitting appropriate for above-ground and in-wall applications on threaded cast iron or steel pipe systems rated at 125 lb service class.

Key Features

• 3 inch nominal MNPT end style for standard threaded pipe connections
• Cast iron construction rated for 125 lb service class
• Galvanized finish for corrosion resistance in damp or exposed environments
• Cored design allows for future tapping without full fitting replacement
• Square head drive provides positive wrench engagement during installation
• Domestically manufactured fitting

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 3 inch nominal threaded cast iron and steel pipe systems operating at 125 lb service class.

Installation Notes

Installation is performed by licensed plumbers or pipefitters using a pipe wrench sized for the square head drive. Always depressurize and isolate the pipe section before removing or installing threaded plugs. Apply an appropriate thread sealant or PTFE tape to the MNPT threads in accordance with local plumbing code requirements. Do not overtighten cast iron fittings, as the material is brittle and susceptible to cracking under excessive torque.

Technical Specifications

• Nominal Size: 3 inches
• End Style: MNPT (Male National Pipe Thread)
• Pressure Class: 125 lb
• Material: Cast Iron
• Finish: Galvanized
• Head Style: Square Head, Cored Regular
• Country of Origin: Domestic (USA)

Standard Information

• Brand: ASC Engineered Solutions
• Manufacturer Part Number: 3.NP