Eaton 3151X4 Square Head Pipe Plug 1/4 in Mnptf

Product Description

The EATON 3151X4 is a square head pipe plug with a 1/4 inch male MNPTF thread, designed to seal off open pipe ends and unused port openings in hydraulic, pneumatic, and fluid-handling systems. Rated to 1,200 psi maximum working pressure and a temperature range of -65 degrees F to 250 degrees F, this straight-fitting plug handles demanding industrial service conditions. The square head drive allows standard wrench engagement for secure installation and reliable removal. Plumbers, pipefitters, and industrial maintenance technicians install this type of plug during system commissioning, pressure testing, and port capping operations.

This plug is suited for use in industrial piping systems, hydraulic manifolds, and fluid power assemblies where an MNPTF threaded port requires a leak-tight closure. The straight configuration and compact 3/4 inch overall length make it a practical choice for tight-access port locations. It conforms to ASA, ASME, and SAE standards, making it appropriate for commercial and industrial installations where code-compliant fittings are required.

Key Features

• 1/4 inch MNPTF male thread for tapered pipe thread sealing
• 1,200 psi maximum working pressure rating
• Temperature range: -65 degrees F to 250 degrees F
• 3/4 inch overall length for compact fitment
• Square head drive for positive wrench engagement
• Meets ASA, ASME, and SAE standards

Compatibility

Designed as an OEM-style replacement plug for industrial piping, hydraulic, and fluid power systems requiring a 1/4 inch MNPTF square head pipe plug rated to 1,200 psi.

Installation Notes

Installation should be performed by a qualified pipefitter or industrial maintenance technician. Depressurize and isolate the system completely before removing or installing any threaded pipe fitting. Apply an appropriate thread sealant or PTFE tape to the male threads per the system fluid and pressure requirements. Torque the plug using a properly sized wrench on the square head; do not use pliers or adjustable tools that may damage the head drive.