Merit Brass 3417DA-06 Square Head Pipe Plug 3/8 in Ss

Product Description

The MERIT BRASS 3417DA-06 is a square head pipe plug designed to seal threaded pipe ends in plumbing, hydraulic, and industrial piping systems. Constructed from 304/304L stainless steel, this plug offers corrosion resistance suited for demanding service environments. The male NPT (MNPT) threaded connection provides a reliable, pressure-rated seal at up to 3,000 psi. The square head drive profile allows installation with a standard wrench or socket. Licensed plumbers and pipefitters install this type of fitting during system assembly, pressure testing, and service work where an unused port or branch line must be closed off cleanly.

This plug is appropriate for residential and commercial piping applications where a corrosion-resistant closure is required on a 3/8 inch threaded female port. Typical use cases include hydraulic systems, compressed air lines, water supply systems, and industrial process piping. The 304/304L stainless steel construction makes it a practical choice in wet, corrosive, or sanitary-adjacent environments where carbon steel fittings are not suitable.

Key Features

• 304/304L stainless steel construction for corrosion resistance in wet and industrial environments
• 3,000 psi pressure rating suitable for high-pressure piping and hydraulic applications
• MNPT threaded end connection for standard pipe thread engagement
• Square head drive profile compatible with standard wrenches and sockets
• 3/8 inch fitting size for common branch and port closure applications

Compatibility

Designed as an OEM-style replacement or standard fitting for 3/8 inch female NPT threaded ports in residential and commercial piping systems.

Installation Notes

Installation is typically performed by a licensed plumber or pipefitter following applicable IPC or IFGC guidelines. Depressurize and isolate the line before installing or removing any threaded plug. Apply an appropriate thread sealant or PTFE tape to the MNPT threads before torquing to avoid galling on stainless steel fittings. Do not overtighten, as stainless steel threads are susceptible to galling without proper lubrication.