Merit Brass C117-08 Brass Square Head Plug 1/2 in Class 125

Product Description

The MERIT BRASS C117-08 is a brass square head pipe plug designed for sealing threaded pipe ends in plumbing, HVAC, and industrial piping systems. Machined with a 1/2 inch MNPT x FNPT connection, this plug threads into female NPT fittings to cap off unused ports or branch connections. Rated Class 125, it is suited for low-to-moderate pressure applications. The square head profile accepts a standard wrench for reliable torque without marring. At 0.05 pounds, it is compact and lightweight. Licensed plumbers, pipefitters, and HVAC technicians routinely use this type of plug when capping pressure-test ports, unused tee branches, or manifold outlets.

This plug is appropriate for residential and light commercial piping installations where NPT threaded brass fittings are standard. Common applications include capping off unused ports on manifolds, shutting off branch lines during system modifications, and sealing test ports after pressure verification. It is rated Class 125, making it suitable for water, air, and other compatible media at moderate pressures. The brass construction provides corrosion resistance in wet plumbing environments.

Key Features

• Square head drive accepts a standard open-end or adjustable wrench for secure installation and removal
• 1/2 inch MNPT x FNPT threaded connection for compatibility with standard NPT pipe systems
• Class 125 pressure rating suitable for water, air, and general-purpose piping service
• Brass construction resists corrosion in plumbing and HVAC wet environments
• Compact and lightweight at 0.05 pounds — easy to stock and carry in a service kit

Compatibility

Designed as an OEM-style replacement and general-use fitting for standard 1/2 inch NPT threaded brass piping systems in residential and light commercial plumbing and HVAC applications.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with applicable local plumbing codes and IPC guidelines. Shut off and depressurize the system before installing or removing any threaded pipe plug. Apply an appropriate thread sealant or PTFE tape to the male threads before tightening. Do not overtighten — use a wrench on the square head and stop once the plug is snug and leak-free.