Eaton 621X3 Compression Tube Union

Product Description

The EATON 621X3 is a compression tube union fitting designed to join two fluid or pneumatic lines with matching compression-style end connections. Both ends accept standard compression fittings, allowing a technician to create a secure, leak-resistant inline connection without soldering or threading. This type of union is commonly found in HVAC refrigerant line accessory circuits, plumbing supply runs, and light pneumatic systems. It is installed by licensed plumbers, HVAC technicians, and pipefitters working on tubing runs that require a removable, rebuildable connection point. At 0.0375 pounds, the fitting is a compact, lightweight component suited for tight installations.

Compression tube unions are used wherever two tubing sections must be joined inline and the connection may need to be broken for future service. Typical applications include residential and light commercial plumbing, HVAC copper or aluminum tubing runs, instrumentation lines, and any system requiring a union-style break point. The compression-on-both-ends design eliminates the need for heat or specialized tooling beyond a properly sized wrench, making field installation straightforward.

Key Features

• Compression x Compression end connections on both sides for tool-free, solder-free assembly
• Union configuration allows the connection to be disconnected and rejoined without cutting tubing
• Lightweight construction at 0.0375 pounds minimizes load in tight tubing assemblies
• Single-piece packaging suitable for individual repair or replacement jobs
• Inline union geometry keeps tubing runs straight without offset

Compatibility

Designed as an OEM-style replacement or new-installation fitting for compression tubing systems in residential and light commercial HVAC, plumbing, and pneumatic applications.

Installation Notes

Installation is performed by a licensed plumber or HVAC technician. Before servicing any pressurized line, shut off the fluid or refrigerant supply and relieve system pressure completely. Compression fittings require a correctly sized ferrule and nut seated squarely on the tubing — overtightening can crack the ferrule or deform soft tubing. Follow applicable IPC or IFGC guidelines and local code requirements for the system being serviced.