Early in the sailing season, the things we overlooked during winter storage can come back to haunt us. And with regard to our boat's sanitation system, the spooky item is usually the marine toilet. Seals are often the first to go, with telltale waterlines dripping from the pump body. Less obvious are failures at the joker valve, the duck-billed rubber valve that prevents flushed water (and odor) from returning to the bowl. If you can't completely flush your marine toilet, the joker valve may be failing.
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