Chrome plated cast bronze fills for gas, diesel, water and unmarked. A key and O-ring are included. The 1-1/4" and 1-1/2" caps have a slot between holes. Screw size is 8. Use spare key series 1248 and spare O-ring series 513.
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Chain was not included in the Perko Deck fill.
I was not happy to find that there was no chain to keep from loosing the cap overboard.