Need a cap for one of the deck water fills. Deck fitting is marked "Marinium" which was a Willcox-Crittenden trade name. Fill plate is black plastic & measures just shy of 2" across the top. If you have one in your junk box from a replaced deck fill, will pay hard cash for it.
After some sleuth work found the cap. It is: Perko P/N 1269DP099A. Amazon has them. Cheers!