Eaton 3300X4 Brass Pipe Coupling 1/4 in Fnptf 1200 Psi

Product Description

The EATON 3300X4 is a straight brass pipe coupling with 1/4 inch FNPTF (Female National Pipe Taper Fuel) female threads on both ends. It connects two pipe segments in a straight-line configuration, maintaining a leak-free joint in fluid and gas transfer systems. Rated to 1,200 psi maximum working pressure and a temperature range of -65 degrees F to 250 degrees F, this coupling is built for demanding industrial and mechanical service environments. Licensed plumbers, pipefitters, and HVAC technicians install this type of fitting in hydraulic, pneumatic, fuel, and general-purpose plumbing systems where a reliable threaded union is required.

This coupling suits residential and light commercial applications involving compressed air lines, fuel distribution, hydraulic circuits, and water service piping. The FNPTF thread standard provides a dry-seal connection that relies on thread deformation to achieve a pressure-tight seal without requiring sealant tape in every installation scenario, though standard installation practice still recommends thread sealant or PTFE tape for fluid service. The straight fitting shape makes it a straightforward inline connector for joining same-size pipe or hose ends.

Key Features

• 1/4 inch FNPTF female threads on both ends for straight inline coupling
• 1,200 psi maximum working pressure rating
• Operating temperature range: -65 degrees F to 250 degrees F
• Full brass construction for corrosion resistance in fluid and gas service
• 3/4 inch hex size for standard wrench installation
• Meets SAE 130138 standard

Compatibility

Designed as an OEM-style replacement straight pipe coupling for industrial, hydraulic, pneumatic, and plumbing systems using 1/4 inch FNPTF threaded connections.

Installation Notes

Installation is performed by a licensed plumber, pipefitter, or qualified HVAC technician. Shut off and depressurize the system completely before removing or installing any threaded fittings. Apply thread sealant or PTFE tape per standard practice for the service fluid. Use a properly sized wrench on the 3/4 inch hex to avoid deforming the fitting body — do not use pipe wrenches directly on the hex flats if avoidable.