The CK 300M Medium Back Cap with O-Ring is engineered for professional TIG welding torches, specifically compatible with 17, 18, and 26 style CK 3 Series models. This pack includes two durable back caps designed to maintain the integrity of your torch’s gas seal, ensuring consistent shielding gas coverage during welding. The O-ring provides a secure, leak-resistant fit that supports optimal torch performance and durability over time.Features: Fits CK 17, 18, and 26 style TIG torches (3 Series) Includes two medium-sized back caps with O-rings Helps maintain consistent shielding gas flow Genuine CK Worldwide replacement parts Compatible with other manufacturers' TIG torches Specifications: Model Number=CK 300M Size=Medium Quantity=2 Packs Includes O-Rings=Yes Quantity: 2 pack Compatible with CK 17/18/26 TIG torch styles Includes two medium back caps with O-rings Ensures reliable gas seal during welding Genuine CK Worldwide replacement parts Works with other manufacturers’ torches