I was able to source new tank inspection ports in Toronto at Holland Marine Products. (HMP) holland marine.com The amount of original and replacement C&C parts Peter has in stock is impressive. There is an online catalogue. If you have changed the O rings and just want to caulk the cap, silicone will not seal to the plastic tank but I have had good luck in with butyl tape rolled like caulk on my holding tank. Not sure if it would contaminate fresh water tanks or not! As a side note HMP does plastic welding for new fitting relocation or repairs too and no I don't work there, he has solved a few boat problems for me over the years. Len Mitchell Crazy Legs 89 37+ Midland On
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