Hi, All -- I am a brand new Catalina owner (me not the boat)--1975 Catalina 27; my boat is up on blocks in a boatyard in Tidewater VA, and winter is approaching. Can someone tell me what needs to be done to winterize and how to do it for: the Atomic 4, the head and bladder holding tank, and the potable water supply? This topic is probably one that has been covered to death before, and if you want to answer me offline, I'd be pleased to receive e-mails at williamsre@nswccd.navy.mil. Thanks, Ted