Merit Brass K617H-64 Hex Plug 4 Inch 316 Ss Mnpt Pipe Fitting

Product Description

The MERIT BRASS K617H-64 is a 4-inch hex plug designed to dead-end or seal threaded pipe systems. Machined from 316 stainless steel, it connects via male NPT (MNPT) threads and is rated to 150 psi. At 1-15/16 inches in length and 4.34 pounds, it is built for demanding plumbing, industrial, and process piping applications where corrosion resistance matters. Licensed plumbers and pipefitters install this fitting during system pressure testing, line isolation, or permanent pipe termination. The 316 alloy provides better chloride resistance than 304 stainless, making it suitable for marine, chemical, and high-moisture environments.

This hex plug is used in residential and commercial plumbing systems, as well as light industrial and process piping where stainless steel threaded fittings are required. It is appropriate for liquid and gas service lines that operate within the 150 psi pressure rating. The hex head design allows standard wrench engagement for reliable torque during installation. Typical scenarios include capping unused branch outlets, sealing test ports, and permanently closing threaded pipe ends in corrosive or sanitary environments.

Key Features

• 316 stainless steel construction for superior corrosion and chloride resistance
• 4-inch MNPT end connection for direct thread engagement into female NPT fittings
• 150 psi pressure rating suitable for standard service piping applications
• Hex head design accepts standard pipe wrenches or open-end wrenches
• 1-15/16 inch overall length for compact inline or branch installation

Compatibility

Designed as an OEM-style threaded pipe fitting for use in any 4-inch female NPT pipe connection requiring a stainless steel hex plug closure.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter in accordance with applicable IPC or IFGC code requirements. Depressurize and drain the line completely before removing any existing fitting or installing this plug. Apply appropriate thread sealant tape or compound to the MNPT threads before engagement. Do not overtighten; use a calibrated wrench and follow standard trade practice for stainless threaded connections to avoid galling.