27-13-2 - Weldcraft 27-13-2 Back Cap O-Ring (2-Pack)

Don't Let a Leaking Torch Ruin Your Weld

There is nothing more frustrating than prepping your material, sharpening your tungsten, and striking an arc, only to see porosity appear in your puddle. Often, the culprit isn't your technique or your gas flow rate—it's a fifty-cent piece of rubber that has dried out. The Weldcraft 27-13-2 O-Ring is the standard replacement seal for the back caps on the most popular TIG torches in the industry, including the 17, 18, and 26 series. This simple yet essential component ensures that your expensive Argon or Helium shielding gas stays inside the torch until it reaches the nozzle.

Welders Supply understands that downtime costs money. That is why we stock genuine Weldcraft parts that you can rely on. This 2-pack of O-rings is a must-have for any welder's toolbox. Over time, the heat from the torch and the friction from changing tungsten electrodes can cause the original O-rings on your back caps to flatten, crack, or tear. When this happens, air is sucked into the shielding gas stream via the Venturi effect, contaminating your weld. A fresh 27-13-2 O-ring restores the seal instantly, bringing your torch back to peak performance.

Features and Benefits

• Perfect Fit: Designed specifically for Miller/Weldcraft torches, ensuring no forcing or pinching during installation.
• Durable Material: Made from industrial-grade rubber that withstands the heat and wear of daily welding operations.
• Cost-Effective Maintenance: Replacing an O-ring is significantly cheaper than reworking a failed weld or replacing an entire back cap assembly.
• Versatile: Fits a wide array of torches, including the CS300, CS310, and CS410 models.

Whether you are a hobbyist working in your garage or a professional fabricator on the production line, maintaining your equipment is key to quality results. Check your back cap O-rings regularly for signs of wear, such as flat spots or small cracks. If you see damage, swap it out with a new Weldcraft 27-13-2 O-Ring. It is a small part that makes a massive difference in weld quality.