Matco-norca mn-zmgpl02 Galvanized Square Head Pipe Plug 3/8 in

Product Description

The MATCO-NORCA mn-zmgpl02 is a 3/8-inch galvanized malleable iron square head pipe plug designed to seal threaded pipe ends in plumbing and piping systems. Manufactured to ASTM A197 and A197M material standards, this plug carries a 150 lb pressure class rating with a working pressure of 300.23 psi. Its galvanized finish provides corrosion resistance in exposed or damp environments. Standing 0.79 inches in height, it fits standard 3/8-inch threaded connections and is suited for use across a temperature range of -20 to 151 degrees F. Licensed plumbers and pipefitters install this fitting as a termination point for unused pipe ports or branch outlets.

This plug is commonly used in residential and light commercial plumbing, HVAC hydronic systems, and industrial piping applications where a threaded pipe port needs to be closed off. The square head drive allows installation with a standard wrench, making it practical in tight spaces where a full fitting wrench may not clear. Typical install scenarios include capping unused tee or cross outlets, blanking ports on manifolds, and temporary line closures during system modification or testing.

Key Features

• 3/8-inch threaded connection size for standard NPT pipe fitting systems
• 150 lb pressure class rated at 300.23 psi working pressure
• Malleable iron construction meeting ASTM A197 and A197M standards
• Galvanized finish for corrosion resistance in damp or exposed conditions
• Square head drive for wrench installation in confined spaces
• Rated for service from -20 to 151 degrees F

Compatibility

Designed as an OEM-style replacement or direct-install fitting for 3/8-inch NPT threaded pipe systems rated at 150 lb pressure class.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with applicable plumbing codes such as the IPC. Shut off and depressurize the line before threading the plug into the fitting. Apply thread sealant or PTFE tape to the male threads before installation. Do not overtighten — use a calibrated torque wrench or standard hand-tight-plus-turns practice appropriate for malleable iron fittings.