Parker 68C-5-4 Compression Tube Connector Brass Mnpt

Product Description

The PARKER 68C-5-4 is a brass compression tube connector designed to join 5/16-inch OD tubing to a 1/4-18 male NPT threaded port. Constructed from brass and conforming to SAE J-512 standards, this fitting creates a leak-resistant mechanical connection without soldering or flaring. It is rated for a maximum working pressure of 300 psi and handles temperatures from -65 degrees F to 250 degrees F. The compression-by-MNPT configuration makes it a practical choice for connecting soft copper or nylon tubing to threaded fittings and components across a wide range of fluid-handling systems. HVAC technicians, plumbers, and refrigeration mechanics regularly install this type of connector in control lines, instrument tubing, and distribution runs.

This connector is suited for residential and light commercial applications where a reliable, re-makeable tube-to-pipe joint is required. Typical install scenarios include HVAC refrigerant and control tubing, pneumatic instrument lines, fuel lines, and hydraulic circuits operating within the rated pressure and temperature envelope. The NPTF thread standard ensures a pressure-tight seal at the threaded end with proper assembly technique.

Key Features

• Brass construction provides corrosion resistance and durability in fluid-handling service
• Compression x MNPT end connections allow direct tube-to-pipe assembly without flaring or soldering
• Rated to 300 psi maximum working pressure for reliable service in pressurized systems
• Wide temperature range of -65 degrees F to 250 degrees F covers most HVAC and refrigeration applications
• Conforms to SAE J-512 for standardized dimensional and performance requirements
• 1/4-18 NPTF thread ensures a pressure-tight fit at the male NPT end

Compatibility

Designed as an OEM-style replacement or service fitting for compression tube connector applications using 5/16-inch OD tubing and 1/4-18 MNPT threaded ports in HVAC, refrigeration, plumbing, and pneumatic systems.

Installation Notes

Installation should be performed by a licensed HVAC technician, plumber, or qualified mechanic familiar with compressed fluid systems. Shut off and depressurize the system completely before disconnecting or installing any fitting. Apply thread sealant or PTFE tape to the MNPT threads in accordance with local codes and the system fluid type; do not overtighten, as brass fittings are susceptible to thread damage. Verify that the tubing OD and wall thickness are compatible with the compression sleeve before final assembly.