I drained mine by pushing a small bore plastic pipe down the hole, then leading it out through the elephants trunk to down near ground level when on its trailer. Then suck to start a siphon and watch it pour out.
I left the witches hats off for a few days last summer to dry it out a bit
I've now added big Jubilee clips around the bottom of the witches hat as well as the screw down ring. Plus I've arranged the cables more neatly out the top ot the witches hat and put a cable tie around it.
RIBBED For extra pleasure.
Member of the ebay Blue RIB cover club.
Member of the Bombard 380 Aerotec club