Parker PQ-00078 Hydraulic Hose Coupler 6700 Psi Nptf

Product Description

The PARKER PQ-00078 is a threaded hydraulic hose coupler rated for high-pressure fluid transfer applications. Built from stainless steel and configured with an NPTF thread connection, this coupler is designed to maintain leak-free performance in demanding hydraulic systems. It accommodates a 4 mm (1/4-inch) hose diameter with a 1/4-18 thread size and carries a maximum working pressure of 6,700 psi. The overall length is 1.69 inches. With a maximum flow rate of 6.00 GPM, this fitting suits mid-flow hydraulic circuits where pressure integrity and corrosion resistance are priorities. It is installed by hydraulic system technicians and industrial maintenance professionals.

This coupler is suited for use in industrial hydraulic systems, mobile equipment, and high-pressure fluid lines where stainless steel construction is required for corrosion resistance or sanitary service conditions. The NPTF threaded connection provides a dry-seal fit, eliminating the need for additional sealant in properly matched port configurations. It is sold in a package quantity of two units, making it practical for paired connection points or having a backup on hand during service calls.

Key Features

• Maximum working pressure of 6,700 psi for high-pressure hydraulic service
• Stainless steel construction for corrosion resistance in harsh or washdown environments
• NPTF dry-seal threaded connection reduces leak paths without additional sealant
• 1/4-18 thread size with 4 mm hose diameter compatibility
• Maximum flow rate of 6.00 GPM
• Compact overall length of 1.69 inches for space-constrained installations
• Sold in a package of 2 units per order

Compatibility

Part of the PARKER ST series. Designed as an OEM-style hydraulic coupler for 1/4-inch hose lines with NPTF threaded ports operating at up to 6,700 psi.

Installation Notes

Installation should be performed by a qualified hydraulic technician. Depressurize and bleed all hydraulic lines before disconnecting or installing any fittings. NPTF threads rely on thread-form interference for sealing — inspect threads for damage before installation and do not cross-thread. Verify system operating pressure does not exceed the 6,700 psi rating of this coupler.