Eaton FF91494-6S Pipe Seal Nut 3/8 in Fnpt Steel

Product Description

The EATON FF91494-6S is a steel pipe seal nut designed to cap or close off a 3/8-inch female NPT threaded port in a piping system. Seal nuts are threaded closures used to plug unused female ports on manifolds, valves, and fittings, preventing fluid or gas leakage at open connection points. The FNPT thread form provides a tapered interference fit that creates a pressure-tight seal when properly torqued. This part is handled by plumbers, pipefitters, and HVAC technicians during system assembly, modification, or service work where an open port must be sealed off.

This seal nut is suited for industrial and commercial piping applications where an FNPT-threaded port needs to be closed. Common scenarios include plugging unused manifold ports, capping test points, and sealing branch connections that are not active in the current system configuration. Its steel construction makes it appropriate for use in moderate-pressure fluid and gas systems where durability and thread integrity are required.

Key Features

• 3/8-inch female NPT thread for tapered, pressure-tight engagement
• FNPT connection type compatible with standard NPT-threaded ports
• Steel construction for durability in industrial service environments
• Compact, single-piece design with no additional hardware required

Compatibility

Designed as an OEM-style closure fitting for any standard 3/8-inch female NPT threaded port in industrial, commercial, or mechanical piping systems.

Installation Notes

Installation is performed by licensed plumbers or pipefitters in accordance with applicable codes such as the IPC or IFGC. Shut off system pressure and depressurize the line before installing or removing any threaded pipe fitting. Apply appropriate thread sealant or PTFE tape to the male threads prior to engagement. Do not overtighten steel fittings in soft-material threaded ports, as thread damage can result.