Merit Brass 3617HD-12 3/4 in Hex Plug 316 Ss Mnpt 3000 Psi

Product Description

The MERIT BRASS 3617HD-12 is a 3/4-inch male NPT hex plug designed to close off the end of a threaded pipe or fitting in high-pressure fluid and gas systems. Machined from 316/316L stainless steel, this plug delivers strong resistance to corrosion, including chloride and acidic environments common in industrial and mechanical piping. The hex head allows for wrench tightening to a secure, leak-free seal. Rated to 3,000 psi, it is built for demanding service where a standard carbon steel or brass plug would corrode or fail. Plumbers, pipefitters, and mechanical contractors working on process piping, chemical lines, or marine installations will find this plug a reliable choice.

This hex plug suits a wide range of applications including industrial process piping, hydraulic and pneumatic systems, HVAC chilled water and steam piping, marine plumbing, and chemical handling lines where stainless steel is specified. The MNPT thread pattern conforms to standard NPT dimensions, making it compatible with typical Schedule 40 and Schedule 80 threaded pipe fittings in 3/4-inch size. It is appropriate for both residential and commercial mechanical systems that call out 316 or 316L stainless steel fittings.

Key Features

• 316/316L stainless steel construction for superior corrosion resistance in aggressive environments
• 3,000 psi pressure rating suitable for high-pressure piping systems
• 3/4-inch MNPT threading for standard NPT pipe compatibility
• Hex head design allows wrench engagement for positive, leak-free tightening
• Low-carbon 316L grade supports welding applications without sensitization risk

Compatibility

Designed as an OEM-style threaded pipe fitting replacement for 3/4-inch MNPT connections in systems requiring 316 or 316L stainless steel hex plugs rated to 3,000 psi.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC and ASME B1.20.1 thread engagement standards. Shut off and depressurize the piping system completely before removing or installing any threaded plug. Apply an appropriate thread sealant or PTFE tape rated for the service fluid and pressure before threading in the plug. Do not use pipe wrenches in a way that damages the hex head or threads, and avoid over-torquing, which can stress or crack fittings.