Parker 66HD-6-6 Compression Tube Connector 3/8 in Brass

Product Description

The PARKER 66HD-6-6 is a brass compression tube connector designed to create a secure, leak-tight joint between a compression tube end and a female NPT threaded port. Built from solid brass, this fitting handles working pressures up to 1500 psi, making it suitable for hydraulic, pneumatic, and fluid-transfer lines in demanding trade environments. The compression end grips the tube mechanically without solder or adhesives, while the FNPT end threads directly into a standard female pipe port. Licensed plumbers, HVAC technicians, and industrial piping mechanics typically install this fitting during system assembly or repair.

This connector is used wherever a tubing run must terminate or transition into a female NPT-threaded fitting. Common applications include refrigeration and HVAC copper or brass tubing connections, plumbing supply lines, hydraulic control circuits, and instrumentation tubing. The 3/8 inch thread size suits mid-range tubing diameters found throughout residential and light commercial mechanical systems. It is sold individually with a minimum order quantity of one unit.

Key Features

• Brass construction resists corrosion and withstands high-pressure service up to 1500 psi
• Compression x FNPT end connections allow tool-free tube engagement on the compression side
• 3/8 inch thread size fits standard female NPT ports common across plumbing and HVAC equipment
• No solder or thread sealant required on the compression end simplifies installation
• Compact connector profile fits in tight mechanical spaces

Compatibility

Designed as an OEM-style replacement or service fitting for systems using 3/8 inch compression-to-FNPT connections in plumbing, HVAC, refrigeration, and fluid-handling applications.

Installation Notes

A licensed plumber or qualified HVAC technician should depressurize and isolate the line before installing or replacing this fitting. The FNPT end requires thread sealant tape or compound applied per the International Plumbing Code or applicable local code. The compression end should be tightened to snug plus a controlled turn using an open-end wrench — do not over-tighten, as brass compression fittings can crack the ferrule. After installation, pressure-test the joint before returning the system to service.