“Marelon” seacocks and Zebra mussels?

There seems to be a problem with many “Marelon” plastic type seacock valves being stuck in the (usually) open position. This may be the result of Zebra mussels in the valves.  Like all seacock valves these need to be opened and closed several times a year to prevent seizure. 

Here is a “Marelon” plastic valve, common on  C&C and Hinterhoeller  boats.


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