I think that you can find a hole saw to use with a drill to make the size hole for the first or second access port hole. You can also check with a marine store and find something to kill the algae. You will probably need a steam cleaner pressure washer to clean the tank after algae is killed.
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Paw John / Krista
2004, 36TK3 MS
2002, F350 4x4 CC Dually
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