Seadog Deck Fill Cap Slotted Diesel Green 357016-1 by Seadog $6.70 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Seadog Deck Fill Cap Slotted #354-3570161 Green Diesel Cap Only. Cap threads are 1-1/4" x 11-1/2 NPSM straight.