Eaton 681X6 Compression Tube Connector 3/8 Od Brass 2000 Psi

Product Description

The EATON 681X6 is a brass compression tube connector designed to join 3/8 inch outside diameter tubing to a male National Pipe Taper Fittings (MNPT) threaded port. It uses a compression-style end connection on one side and a MNPT thread on the other, conforming to NPTF thread standards. The fitting is rated to 2000 psi maximum working pressure and handles temperatures down to -65 degrees F, making it suitable for demanding hydraulic, pneumatic, and fluid transfer applications. Licensed HVAC technicians, plumbers, and fluid power technicians are the primary installers of this type of fitting.

This connector is commonly used in residential and light commercial systems where copper or nylon tubing must terminate at a threaded port. Typical applications include refrigeration line connections, compressed air distribution, hydraulic control lines, and fuel or oil systems. The brass construction provides corrosion resistance in a wide range of fluid media. Its compact 1.315 inch overall length makes it practical in tight service spaces where larger fittings would not fit.

Key Features

• Compression x MNPT end connections for tubing-to-threaded-port transitions
• Rated to 2000 psi maximum working pressure
• Brass construction for corrosion resistance across a wide range of media
• Temperature range starting at -65 degrees F
• NPTF thread standard for pressure-tight sealing without sealant tape on many applications
• Meets ASA, ASME, and SAE standards

Compatibility

Designed as an OEM-style replacement or new-installation compression connector for systems using 3/8 inch OD tubing with MNPT threaded ports in HVAC, plumbing, hydraulic, and fluid transfer applications.

Installation Notes

Installation is typically performed by a licensed plumber, HVAC technician, or fluid power mechanic. Shut off and depressurize the system completely before removing or installing any compression fitting. Do not over-tighten the compression nut, as this can deform the ferrule and cause leaks. Verify thread compatibility and apply thread sealant per the applicable system requirements and local code, referencing IPC or IFGC guidelines where appropriate.