Seadog Deck Fill Cap Slotted Gas Red 357015-1 by Seadog $5.52 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Seadog Deck Fill Cap Slotted Gas Red #354-3570151 Red Gas Cap Only. Cap threads are 1-1/4" x 11-1/2 NPSM straight.