Plastic Deck Filler Ø 38 mm Flip-Top Water Cap | 4BoatsFlip top deck filler for water use from Plastic Deck, designed to fit decks with a 38 mm opening. Flip top cap one handed access for water refilling 38 mm (1. 5 in) diameter fits standard 38 mm deck cut outs Plastic construction lightweight and corrosion resistant Compact low profile minimal protrusion above the deck Easy installation fits into matching deck holes For water use only Designed for standard 38 mm deck cut outs; check your existing filler