18-7 - CK Worldwide 18-7 Back Cap Insulator for 17/18/26 Series TIG Torches

Keep Your TIG Torch Sealed and Safe

Is your TIG torch sputtering or leaking gas near the back cap? It might be time to replace your back insulator. The CK Worldwide 18-7 Insulator is the small but mighty part that sits between your torch head and the back cap. It performs one of the most important jobs in your setup: keeping the shielding gas flowing forward to the puddle and stopping the electricity from zapping things it shouldn't. Over time, heat and wear can crack these insulators, leading to frustrating gas leaks that ruin your welds with porosity.

Designed to fit the most popular torches in the game, this insulator works perfectly with any 17, 18, or 26 series TIG torch. Whether you are running a classic Weldcraft WP-17 air-cooled rig in your garage or a heavy-duty water-cooled WP-18 in a fabrication shop, this CK replacement part fits like a glove. It is built to handle the heat, resisting cracking and deformation better than cheap generic alternatives. Don't let a $5 part cost you hours of rework.

Installation is a breeze—just pop off your back cap, slide the old insulator off, and seat the new one in place. It seals up tight against the torch body, ensuring that 100% of your expensive argon goes exactly where you need it: over the tungsten and onto the weld. Grab a few for your kit so you never get stuck with a leaky torch in the middle of a project.

Why Welders Choose CK Insulators

• Perfect Fit: Matches WP-17, WP-18, and WP-26 threads and seals perfectly.
• Durable Material: Stands up to high amperage heat without melting or becoming brittle.
• Gas Saver: Stops invisible leaks at the back of the torch that waste argon.
• Universal: Works with standard collets, gas lenses, and all back cap sizes (short, medium, long).