ITEM NAME:5pcs Long Back Cap Fit For TIG Welding Torch WP-17 WP-18 WP-26 57Y02 11.2cm 5pcs Long Back Cap Fit For TIG Welding Torch WP-17 WP-18 WP-26 57Y02 SPECIFICATIONS.(Manufacturer Part Number: 57Y02. Suitable for: argon arc welding. fit for all 17 & 26 series air cooled torches and 18 series water cooled torches. 2) Color may vary slightly due to the color setting of each individual monitor.