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Sea-Dog's® fiberglass filled injection molded nylon deck fills contain no metal and do not require grounding to the boats electrical system. Caps are color-coded for easy deck fill identification eliminating dangerous and potentially costly problems caused by miss-identification. 1-1/4" - 11-1/2 NPSM straight cap threads. Gas, diesel and water caps include attachment chains. Installs with three #10 FH fasteners (not included).