Parker 68HD-6-4 Compression Tube Connector 3/8 in Brass

Product Description

The PARKER 68HD-6-4 is a brass compression tube connector designed to join 3/8 inch outside diameter tubing to a male NPT threaded port. It uses a compression-style end connection that creates a leak-resistant mechanical seal without soldering or brazing. Rated to 1500 psi maximum working pressure and suitable for temperatures from -65 degrees F to 249 degrees F, this fitting handles demanding service conditions in refrigeration, pneumatic, and fluid distribution systems. Plumbers, HVAC technicians, and pipefitters install this connector where a reliable, reusable tube-to-thread transition is required.

This connector is suited for residential and light commercial applications involving copper or compatible tubing routed to threaded fittings on valves, manifolds, or equipment ports. The compression-by-MNPT configuration makes it a common choice in refrigerant line accessories, compressed air distribution, hydraulic instrument lines, and plumbing supply connections. Its brass construction resists corrosion in both wet and dry service environments, making it appropriate for indoor mechanical rooms, equipment closets, and similar installations.

Key Features

• Compression x MNPT end connections for tool-accessible, no-solder installation
• Rated to 1500 psi maximum working pressure
• Operating temperature range of -65 degrees F to 249 degrees F
• Brass construction for corrosion resistance in wet and dry service
• 3/8 inch tube outside diameter compression end

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems using 3/8 inch OD tubing terminating at a male NPT threaded port in HVAC, plumbing, and pneumatic applications.

Installation Notes

Installation is performed by licensed plumbers, HVAC technicians, or pipefitters. Shut off and depressurize the system completely before removing or installing any compression fitting. Hand-tighten the compression nut onto the MNPT port first, then tighten with a wrench per standard trade practice — do not overtighten, as this can deform the ferrule and compromise the seal. Verify the connection is leak-free under system pressure before returning the system to service.