Parker 66HD-6-4 Compression X Fnpt Brass Connector 1/4 in

Product Description

The PARKER 66HD-6-4 is a brass compression tube connector designed to join tubing to female NPT-threaded ports in fluid and gas distribution systems. It features a compression inlet on one end and a female NPT (FNPT) threaded connection on the other, providing a reliable, leak-resistant joint without soldering or flaring. Rated to 1500 psi maximum working pressure, this fitting is suited for demanding hydraulic, pneumatic, refrigeration, and instrumentation plumbing applications. The brass construction offers corrosion resistance and durability in both wet and dry service environments. Licensed plumbers, HVAC technicians, and industrial pipefitters commonly specify this type of fitting during system assembly or repair.

This connector is used in residential and commercial plumbing, HVAC refrigerant line sets, compressed air distribution, and instrumentation tubing runs where a transition between compression tubing and a female NPT threaded port is required. It is appropriate for applications involving water, air, oil, and compatible gases. The 1/4 inch thread size makes it a common selection for small-bore control lines, sensing lines, and branch connections throughout trade and industrial installations.

Key Features

• Compression x FNPT end connections allow tool-simple installation without soldering or flaring
• 1500 psi maximum working pressure rating for demanding fluid and gas service
• Brass construction provides corrosion resistance in wet and dry environments
• 1/4 inch female NPT thread conforms to standard FPT thread specification
• Compact connector body suits tight-space installations in control panels and equipment cabinets

Compatibility

Designed as an OEM-style compression-to-FNPT connector for use in plumbing, HVAC, pneumatic, and instrumentation systems requiring a 1/4 inch female NPT port connection with a compression tube inlet.

Installation Notes

Installation is typically performed by a licensed plumber or HVAC technician. Shut off system pressure and relieve any residual pressure in the line before disassembly or fitting installation. Ensure the compression nut and ferrule are seated squarely on the tubing before tightening to avoid leaks. Do not overtighten the compression nut, as brass fittings can deform if excessive force is applied. Verify thread compatibility and torque the FNPT connection in accordance with applicable IPC or system manufacturer guidelines.