Parker 68HD-6-6 Compression Tube Connector 3/8 in Brass

Product Description

The PARKER 68HD-6-6 is a brass compression tube connector designed to join 3/8-inch OD tubing to a male NPT threaded port. It provides a leak-resistant, mechanical connection without soldering or flaring. The compression-to-MNPT end configuration makes it a practical fitting for plumbing, HVAC, and fluid-handling systems where a reliable tube-to-pipe transition is needed. Rated to 1500 psi maximum working pressure, this connector handles demanding service conditions. The brass construction offers corrosion resistance and durability across a wide temperature range, from -65 degrees F to 249 degrees F. Licensed plumbers, HVAC technicians, and pipefitters typically install this type of fitting in both residential and light commercial applications.

This connector suits installations where copper or compatible OD tubing must terminate at a male NPT threaded fitting. Common applications include refrigeration lines, compressed air systems, hydraulic instrument lines, and process fluid connections. The compression end accepts 3/8-inch OD tubing, while the MNPT end threads directly into a female-threaded port or valve body. It is suited for both new installations and service replacements where a solderless connection is preferred or required by job conditions.

Key Features

• Compression x MNPT end configuration for tubing-to-pipe transitions
• Rated to 1500 psi maximum working pressure
• Operating temperature range: -65 degrees F to 249 degrees F
• Brass construction for corrosion resistance and long service life
• Solderless, tool-assisted compression connection — no flaring required
• Compact single-piece connector body

Compatibility

Designed for use with 3/8-inch OD tubing and standard male NPT threaded ports. Suitable for compression fittings applications in HVAC, plumbing, refrigeration, and fluid-handling systems where MPT thread standard connections are specified.

Installation Notes

Installation is typically performed by a licensed plumber or HVAC technician. Shut off system pressure and depressurize the line before removing or installing compression fittings. Use two wrenches when tightening the MNPT end into a threaded port to avoid twisting downstream tubing. Do not overtighten the compression nut — follow the fitting manufacturer's guidelines for turns past finger-tight, and verify the connection is leak-free before returning the system to service.