Mystery portal in the bottom of my Ericson

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Nov 18, 2011
2
None non michigan City
I have been refurbishing my Ericson 25 CB. In the cabin on the floor on the threshold to the head , there is a round clear plastic site glass that peers into the innerspaces of the bilge. The lead is visible through this opening. Its cracked and i am afraid it will leak.
What in the heck is this for?
The Rock
 
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