Ref No 10N46 8# D12.5 x 47mm. TIG Alumina Nozzles Ceramic Cup Fit QQ300 DB PTA SR WP CK 17 18 26 TIG Welding Torch. This Gas lens & Collet kits fits all 17 & 26 series air cooled torches and 18 series water cooled torches, including the Lincoln PTA-17, PTA-18 and PTA-26 torches, Miller Diamondback DB17,DB18 and DB 26 torches, along with the Weld craft WP-17, WP-18 and WP-26 torches.