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7.7 bilge access in head

Jul 21, 2016
san juan 7.7 wabamun
Hello all, I'm new here. I've owned my 7.7 for just over a year now and of course an doing many repairs and upgrades. One concern is this access in the floor of the head. There is no other access, in or out. No thru hulls, or drains.
At first I thought it was an access for the sink thruhull, but it isn't visible. I thought maybe a black water holding tank but there is no external drain. It is holding a little water, maybe a couple litres, that doesn't seem to leak out anywhere.
Does anyone have any ideas?
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Likes: SJ77GrahamWA
Jul 15, 2020
San juan 7.7 Edmonton
I opened my access up using a larger access cover. I then installed a bilge pump routing the hose through under the vee birth and out above the waterline.