Merit Brass 3617HD-20 Hex Plug 1-1/4 in 316 Ss Mnpt 3000 Psi

Product Description

The MERIT BRASS 3617HD-20 is a 1-1/4 inch hex plug manufactured from 316/316L dual-grade stainless steel. It is designed to close off open pipe ends in threaded piping systems, using a male NPT (MNPT) connection for a secure, leak-resistant seal. Rated to 3,000 psi, this fitting handles demanding pressure conditions found in industrial, commercial, and mechanical service applications. The hex head allows for standard wrench installation without special tooling. Licensed pipefitters, plumbers, and mechanical contractors install fittings of this type across a wide range of fluid handling and process piping systems.

This hex plug is suited for use in plumbing, HVAC hydronic piping, chemical processing, and general industrial piping where corrosion resistance and pressure integrity are required. The 316/316L stainless steel grade provides superior resistance to chlorides and oxidizing environments compared to standard 304 stainless, making it appropriate for marine-adjacent, food-service-adjacent, and chemical service installations. It terminates 1-1/4 inch threaded pipe runs or ports on valves, manifolds, and equipment.

Key Features

• 316/316L dual-grade stainless steel construction for enhanced corrosion resistance
• 3,000 psi pressure rating suitable for high-pressure service
• MNPT threaded end connection for standard pipe thread assembly
• Hex head design accepts common pipe wrenches and socket tools
• 1-1/4 inch fitting size covers a common pipe port and run termination size

Compatibility

Designed as an OEM-style replacement or direct-install fitting for 1-1/4 inch MNPT threaded pipe systems requiring a stainless steel hex plug closure.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable mechanical and plumbing codes. De-pressurize and drain the system fully before removing or installing any threaded pipe fitting. Apply an appropriate thread sealant or PTFE tape rated for the service fluid and pressure before threading the plug into place. Do not over-torque; use a properly sized pipe wrench on the hex head to achieve a snug, leak-free connection.