Open the black caps - holding tanks


Hi everybody.

I've just past more than one our reading yours awesome messages but I can't find the answer for my question. How the black caps on the deck comes out? (to aspirate the contents of the holding tanks or fill them with bleach) I have to unscrew them? I've tried with the stem of an Allen wrench but I'm scared to be too hard and break something...

Thanks a lot.

Lorenzo SM 2000 #420 "Red Passion" currently in Elba Island, Italy.

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