Merit Brass C117-16 Brass Square Head Plug 1 in Mnpt Class 125

Product Description

The MERIT BRASS C117-16 is a brass square head plug designed for threaded pipe connections in plumbing, HVAC, and industrial piping systems. It features a 1-inch MNPT x FNPT end connection and is rated Class 125, making it suitable for low-pressure steam, water, oil, and gas service. The square head profile allows for easy wrench engagement during installation and removal. The brass construction provides corrosion resistance across a wide range of fluid and gas applications. Plumbers, pipefitters, and HVAC technicians use this fitting to seal off pipe openings or cap unused branch lines in threaded systems.

This square head plug is used in residential and commercial piping systems where a threaded closure is required. Typical applications include capping unused ports on manifolds, sealing branch tees during pressure testing, and closing off service ports on boilers, chillers, and hydronic distribution systems. The Class 125 pressure rating aligns with standard low-pressure service conditions common in building mechanical systems.

Key Features

• 1-inch MNPT x FNPT threaded connection for standard pipe fitment
• Class 125 pressure rating suitable for water, steam, oil, and gas service
• Square head design provides solid wrench grip for installation and removal
• Brass construction offers corrosion resistance in wet and chemical-bearing environments
• Compact single-piece construction with no moving parts or seals to fail

Compatibility

Designed as an OEM-style replacement or maintenance fitting for standard 1-inch NPT threaded pipe systems rated at Class 125 service conditions.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or IFGC requirements. Apply thread sealant tape or pipe dope to the male threads before installation, and tighten using a wrench on the square head. Shut off and depressurize the system completely before installing or removing any threaded fittings. Do not overtighten brass fittings, as the material is softer than iron and susceptible to thread damage under excessive torque.