Parker 3/4 Gg-s Pipe Coupling 4000 Psi Fnptf Zinc-plated

Product Description

The PARKER 3/4 GG-S is a straight industrial pipe coupling designed for high-pressure fluid and pneumatic systems. Built from zinc-plated steel, it connects two female-threaded lines using FNPTF (Female National Pipe Thread Fuel) connections, providing a secure, leak-resistant seal rated to 4,000 psi maximum working pressure. The coupling measures 1.5 inches in overall length with a 1.375-inch hex size, making it compatible with standard wrenches used in industrial piping work. Plumbers, pipefitters, and industrial maintenance technicians install this type of fitting in compressed air, hydraulic, and fluid transfer applications.

This coupling is suited for straight-line pipe connections in industrial, commercial, and heavy-duty fluid systems where high working pressure is a requirement. The FNPTF thread classification ensures compatibility with fuel, hydraulic, and general-purpose piping assemblies. Its straight fitting shape allows direct inline joining of two pipe ends without angular offset, making it a practical choice for tight or linear pipe runs in mechanical rooms, equipment skids, and industrial process lines.

Key Features

• 4,000 psi maximum working pressure rating for high-demand industrial applications
• FNPTF female thread connection on both ends for secure, fuel-rated sealing
• Zinc-plated steel construction provides corrosion resistance in demanding environments
• Straight fitting shape enables direct inline pipe joining
• 3/4 inch female thread size with 1.375-inch hex for standard wrench engagement
• Compact 1.5-inch overall length suits installations with limited clearance

Compatibility

Designed as an OEM-style replacement or new-installation fitting for industrial pipe systems using 3/4 inch FNPTF female threaded connections rated to 4,000 psi.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter following applicable codes such as ASME B31.1 or B31.3 for pressure piping systems. Depressurize and isolate the line before removing or installing any coupling. Apply appropriate thread sealant or PTFE tape to the male threads being joined, following the sealant manufacturer's guidance for the media being conveyed. Do not over-torque the fitting; use a backup wrench on adjacent fittings to prevent stress on existing piping.