Mine are an absolute mofo to winterize, most of the drains are impossible to get to and space is very limited, I have thru hull water pickups and the remote flush hookups are in the very front of the bilge on the sea strainers and are tough to get to. Ive been contemplating some sort of vacuum/ pump system that will suck antifreeze from the strainer hookups through the cooling system and out at the exhaust manifolds.