Eaton FF4177-06S Square Head Pipe Plug 3/8 in Mnpt

Product Description

The EATON FF4177-06S is a square head pipe plug designed for sealing threaded pipe ports in high-pressure hydraulic and industrial fluid systems. Manufactured from steel, this straight-pattern plug accepts a 3/8 inch male NPT (MNPT) thread and is rated for working pressures up to 6,000 psi. The square head drive allows installation and removal with standard wrenches or sockets without requiring a specialized driver. Licensed plumbers, pipefitters, and hydraulic technicians use this plug to cap unused ports on manifolds, valves, pumps, and cylinders during assembly, maintenance, or system modification.

This plug is suited for use in industrial hydraulic circuits, pneumatic systems, and plumbing assemblies where a dependable threaded closure is required. Its straight fitting shape makes it appropriate for direct port-sealing applications without adapters. The rated operating temperature range of -40 degrees F to 250 degrees F covers most indoor industrial environments and many mobile hydraulic equipment applications. Typical installations include capping spare ports on hydraulic power units, valve bodies, and pipe manifolds.

Key Features

• 6,000 psi maximum working pressure for demanding hydraulic and industrial service
• 3/8 inch MNPT thread for direct installation into standard NPT-threaded female ports
• Steel construction provides durability in high-pressure environments
• Square head drive allows use of common wrenches and sockets
• Straight fitting shape simplifies direct port closure without adapters
• Operating temperature range: -40 degrees F to 250 degrees F

Compatibility

Designed as an OEM-style replacement or service plug for industrial hydraulic and fluid power systems with 3/8 inch female MNPT threaded ports rated to accept fittings up to 6,000 psi.

Installation Notes

Installation should be performed by a qualified pipefitter, hydraulic technician, or licensed plumber following applicable codes such as the IPC or relevant hydraulic system standards. Depressurize and isolate the system completely before removing or installing any threaded plugs. Apply appropriate thread sealant or PTFE tape to the MNPT threads per the system requirements before installation. Do not overtighten — use a torque value specified by the system manufacturer for the port size and material.