Hello there. I recently purchased a 1985 Catalina 30. Going through the systems I am a little stumped. My exhaust anti siphon is set up unlike anything else I have seen in my searching. The line from the heat exchanger as well as the line that goes into the exhaust elbow. Are both routed into one end of the anti siphon U bend. They are together entering the same end of the tube. On the other end is a larger hose. Maybe 3/4" I.D. the end of this just terminates and is laying in the bilge. Can anyone please explain why someone might have done this. I can't find a single thing that would make sense of it. She is still on the hard. But it seems that water from the exhaust would just be constantly draining into the bilge. Instead of cycling all the way through the actual exhaust system.