Merit Brass 3617DA-04 Square Head Plug 1/4 in 316 Ss Mnpt

Product Description

The MERIT BRASS 3617DA-04 is a square head pipe plug designed to close off open pipe ends in high-pressure fluid and gas systems. Machined from 316/316L stainless steel, it delivers strong corrosion resistance in demanding environments where standard carbon steel hardware would degrade. The male NPT thread form creates a secure, leak-resistant seal when installed with appropriate thread sealant. Rated to 3,000 psi, this plug is well suited for industrial piping systems, process lines, and mechanical service applications. Plumbers, pipefitters, and mechanical contractors install this type of fitting as a permanent or temporary dead-end closure during system assembly, testing, and maintenance.

The 3617DA-04 is a 1/4 inch nominal size fitting intended for use in threaded pipe assemblies where corrosion resistance and pressure integrity are priorities. Typical applications include chemical processing lines, marine plumbing, food-grade piping, and HVAC hydronic systems where 316 or 316L stainless steel is specified. The square head drive profile allows installation and removal with a standard wrench, making it practical in tight inline applications where a hex key or specialty tool is not available.

Key Features

• 316/316L stainless steel construction for superior corrosion resistance in harsh and wet environments
• 3,000 psi pressure rating suitable for high-pressure threaded pipe systems
• Male NPT (MNPT) thread form for standard threaded pipe compatibility
• Square head drive allows installation with common hand tools
• 1/4 inch nominal pipe size fits standard 1/4 in threaded pipe ends and fittings

Compatibility

Designed as an OEM-style threaded pipe plug for use in standard 1/4 inch MNPT threaded pipe assemblies and fittings requiring a dead-end closure.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters following applicable IPC or IFGC guidelines for threaded pipe assemblies. Depressurize and isolate the system section before installing or removing any threaded plug. Apply an appropriate thread sealant or PTFE tape to the male threads before installation to ensure a leak-free seal. Do not overtighten stainless steel threaded fittings, as galling can occur without proper lubrication or anti-seize compound.