Parker 66C-8-4 Compression Tube Connector 1/4-18 Fnpt

Product Description

The PARKER 66C-8-4 is a brass compression tube connector designed to join compression tubing to female NPT threaded ports in fluid and pneumatic system lines. It features a 1/4-18 NPTF thread on the female NPT end and accepts standard compression tube fittings on the opposing end. Rated to 200 psi maximum working pressure and a temperature range of -65 to 250 degrees F, this connector suits demanding service environments. Manufactured to SAE J-512 standards, it is installed by licensed plumbers, HVAC technicians, and fluid-system mechanics working on instrumentation, refrigeration, or general hydraulic and pneumatic lines.

The 66C-8-4 is suited for residential and light commercial applications where a compression tube line must transition to a female NPT port. Typical installation scenarios include refrigeration and air conditioning line sets, pneumatic control tubing, and hydraulic instrumentation connections. The compression end provides a reliable tube-to-fitting seal without soldering, while the NPTF threaded end creates a pressure-tight connection with the mating port.

Key Features

• Brass construction provides corrosion resistance and durability in fluid and pneumatic service
• 1/4-18 NPTF thread meets sealing requirements for pressure-tight connections
• Compression x FNPT end configuration allows direct tube-to-port transitions without soldering
• Rated to 200 psi maximum working pressure for reliable performance under load
• Wide operating temperature range of -65 to 250 degrees F covers most field service conditions
• Manufactured to SAE J-512 standards for dimensional and performance consistency

Compatibility

Designed as an OEM-style compression tube connector for fluid and pneumatic systems requiring a compression tube to female NPT port transition with a 1/4-18 thread size.

Installation Notes

Installation should be performed by a qualified technician. Depressurize and isolate the system completely before removing any existing fittings or installing this connector. Apply thread sealant or PTFE tape to the NPTF threads in accordance with applicable plumbing and mechanical codes. Hand-tighten first, then use a wrench to bring the connection to a firm, leak-free seat without over-torquing the brass fitting body.