Parker 68HD-4-4 Compression X Mnpt Brass Tube Connector

Product Description

The PARKER 68HD-4-4 is a brass compression tube connector designed to create a leak-tight mechanical joint between a compression tube end and a male NPT threaded port. With a 1/4 inch thread size and a maximum working pressure of 2100 psi, this fitting handles demanding fluid and pneumatic system applications. The all-brass construction resists corrosion and holds up across a wide temperature range, from -65 degrees F to 121 degrees C (approximately 250 degrees F). It is sized and rated for use in hydraulic lines, pneumatic circuits, instrumentation tubing, and related plumbing assemblies. Licensed plumbers, HVAC technicians, and industrial piping tradespeople are the primary installers.

This connector is suited for residential and light commercial plumbing, HVAC refrigeration lines, pneumatic control systems, and instrumentation installations where a compression-to-MNPT transition is needed. The Compression x MNPT end configuration makes it a standard choice when joining soft copper or aluminum tubing to an NPT-threaded port on a valve, manifold, or fitting body. Single-unit packaging makes it practical for service work and small repairs.

Key Features

• Compression x MNPT end connections for tubing-to-threaded-port transitions
• 1/4 inch thread size to match standard NPT ported components
• Maximum working pressure of 2100 psi for demanding fluid and pneumatic service
• Wide service temperature range: -65 degrees F to approximately 250 degrees F
• Brass construction for corrosion resistance and long service life
• Compact, single-piece connector suitable for tight installations

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems requiring a 1/4 inch Compression x MNPT brass tube connector, including pneumatic, hydraulic, instrumentation, and plumbing assemblies that use standard NPT-threaded ports.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified pipefitter in accordance with applicable codes such as the IPC or IFGC. Always depressurize and isolate the line before removing or installing any compression fitting. Hand-tighten the compression nut first, then advance with a wrench — do not overtighten, as brass fittings can be damaged by excessive force. Verify the tubing is cut squarely and fully seated against the ferrule before final torque to ensure a leak-free joint.