Merit Brass 618B-02 Hex Countersunk Pipe Plug 1/8 in Mnpt

Product Description

The MERIT BRASS 618B-02 is a hex countersunk pipe plug designed to seal threaded pipe openings in plumbing, industrial, and fluid-handling systems. Manufactured from 316/316L stainless steel, it offers strong corrosion resistance in demanding environments including marine, chemical, and high-moisture applications. The male NPT (MNPT) threaded connection makes installation straightforward with standard pipe wrenches or hex keys. Rated at 150 psi, this plug is suited for low-to-medium pressure service. The countersunk hex design allows for flush or recessed installation where a standard hex plug would protrude. Licensed plumbers, pipefitters, and maintenance mechanics are the typical installers.

This plug is used to cap off 1/8 inch MNPT threaded ports on pipe fittings, manifolds, valve bodies, and equipment housings. The 316/316L stainless steel construction makes it a practical choice in corrosive service environments such as saltwater systems, chemical process lines, and food-grade or sanitary piping where carbon steel plugs are not acceptable. At 17/64 inch in length, the compact profile fits in tight spaces without clearance issues. It is sold individually with a minimum order quantity of 6 units.

Key Features

• 316/316L stainless steel construction for superior corrosion resistance
• 1/8 inch MNPT threaded connection for standard pipe fitment
• 150 psi pressure rating suitable for low-to-medium pressure service
• Countersunk hex design allows flush or recessed seating
• Compact length of 17/64 inches fits tight installation spaces
• Lightweight at 0.01 pounds per unit

Compatibility

Designed as an OEM-style replacement or new-installation plug for 1/8 inch MNPT threaded pipe ports in residential and commercial plumbing, industrial piping, and fluid-handling assemblies requiring 316 or 316L stainless steel fittings.

Installation Notes

This fitting is installed by licensed plumbers or pipefitters working on threaded pipe systems. Always depressurize and drain the line before removing or installing any threaded pipe plug. Apply an appropriate thread sealant or PTFE tape to the male threads before installation to ensure a leak-free seal. Follow applicable IPC and ASME B16.39 guidelines for threaded pipe fitting installation.