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If you can remove it, replace it. It will only cost a couple of bucks, and a few hours, but save alot of heartache (and poopy smells).
I also have a new old boat. When I first tried the head there was a problem, no water would pump in. I could fill the bowl with a bucket and pump it out, but nothing would come in. I decided to rebuild the pump. As soon as i got the pump apart I found a huge wad of seaweed plugging the inlet side of the pump. It took me about three seconds to decide to install a strainer in the suction line to pre-empt doing that nasty job again in the near future. Messing with heads is nasty. When the part wears out replace with new if it's cost effective. It beats messing with the same thing again in two months.
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