Installing inspection port for Marlin 300 marine head vent

Rainmand

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Aug 31, 2022
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81
Model
Marlin
I have a 1998 Marlin 300 and am having typical marine toilet odor issues. I believe I have a vent problem; I know where it is located, but don't have an access port to view it through. Can anyone send me a link or instructions on how to install one?

I have tried a variety of "odor eliminators" and freshwater flush; nothing seems to help.