It's one of those things that you don't give much thought to untill something happens. I just happened to be down in the "engine room/cockpit locker" changing the
fuel filter and noticed that water had been leaking at the hose/pipe junction. When I felt the hose it was hard as a rock, probably hadn't been changed in a long time, I had just bought the boat that spring so I don't know how old they were. They will only leak if you are heeled or if the boat is well loaded. I have replaced both hoses with heavy duty radiator hose I got from a NAPA auto parts store. But there is no shut off if something happens. Something else to think about, I have plenty of projects already. If you come up with a suggestion on an improvement in this area pass it on.