Sea Dog Replacement Deck Fill Water Cap- Blue Features Fits Sea Dog brand 1-12 Deck Fills Cap molded from Fiberglass Filled Nylon The cap threads are 1-14 - 11-12 NPSM - Straight Gas, diesel and water caps include attachment chains Built-in key for easy cap removal Caps are molded in special colors to help prevent the dangerous and costly problems caused by placing fuel in water or waste tanks or vice-versa California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Deta