Merit Brass 618B-08 Hex Countersunk Plug 1/2 in 316 Ss

Product Description

The MERIT BRASS 618B-08 is a hex countersunk pipe plug designed for sealing threaded pipe openings in fluid and gas piping systems. Constructed from 316 and 316L stainless steel, it delivers strong corrosion resistance in demanding environments including marine, chemical processing, and industrial applications. The male NPT (MNPT) threaded end connection fits standard 1/2 inch pipe threads, and the plug is rated to 150 psi. Plumbers, pipefitters, and mechanical contractors install this fitting when capping off unused branch outlets or test ports in low-to-medium pressure piping systems.

This plug is suited for residential and commercial piping installations where corrosion resistance and pressure integrity are required. The countersunk hex drive allows flush or near-flush seating against a fitting face, making it a practical choice for tight clearance applications. It is appropriate for use in water, steam, air, and compatible chemical service lines where 316 or 316L stainless steel is specified by system design or code requirements.

Key Features

• 316 and 316L stainless steel construction for superior corrosion resistance in wet and chemical environments
• MNPT threaded end connection for standard 1/2 inch pipe thread engagement
• 150 psi pressure rating suitable for low-to-medium pressure service
• Hex countersunk drive design allows flush installation in confined spaces
• Compact 1/2 inch length fits tight clearance locations

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard 1/2 inch MNPT threaded pipe systems requiring 316 or 316L stainless steel construction.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC or IFGC guidelines for threaded pipe connections. De-pressurize and drain the affected line section before removing or installing any pipe plug. Apply appropriate thread sealant or PTFE tape to the MNPT threads per system fluid compatibility requirements. Do not exceed the 150 psi pressure rating of this fitting.