Usa Industrials ZUSA-PF-321 Hex Socket Pipe Plug 1/4 in Ss

Product Description

The USA INDUSTRIALS ZUSA-PF-321 is a 1/4 inch male NPT hex socket pipe plug machined from 304 stainless steel. It is used to seal off threaded pipe openings in fluid and gas distribution systems. The hex socket drive allows installation and removal with a standard hex key or Allen wrench, making it well suited for tight or recessed access points. Rated to 150 psi, this plug meets ASME B1.20.1 thread standards and is produced to ASTM A351 material specifications. Plumbers, pipefitters, and industrial maintenance technicians commonly install these as system caps or test port closures.

This plug fits into 1/4 inch MNPT threaded ports and is appropriate for use in residential and commercial plumbing, HVAC hydronic systems, compressed air lines, and light industrial piping. Its 304 stainless steel construction resists corrosion in wet and mildly chemical environments. The plug handles operating temperatures from -50 degrees F to 400 degrees F, covering a wide range of plumbing and mechanical system conditions.

Key Features

• 1/4 inch MNPT threaded connection for direct engagement with female NPT ports
• 304 stainless steel construction for corrosion resistance in wet and mild chemical environments
• 150 psi pressure rating suitable for standard plumbing and compressed air applications
• Hex socket drive design allows installation in recessed or tight clearance locations
• Operating temperature range of -50 degrees F to 400 degrees F
• Meets ASME B1.20.1 thread standard and ASTM A351 material specification

Compatibility

Designed as an OEM-style replacement or new-installation fitting for any system with a 1/4 inch female NPT threaded port requiring a pressure-rated stainless steel closure plug.

Installation Notes

Installation is performed by licensed plumbers or pipefitters following applicable IPC or IFGC guidelines depending on the system medium. Shut off and depressurize the line before installing or removing any threaded plug. Apply thread sealant tape or paste rated for the system fluid and pressure before threading the plug into the port. Do not overtighten; use a hex key and turn to hand-tight plus a measured additional engagement consistent with standard NPT thread practice.