The other end of the ice box drain.
Max, On our present boat the vinyl hose emerges from the ice box bulkhead and originally T'd into either the galley sink drain or the fresh water intake for that same sink. Too much time has passed since yanking all that joined plumbing down there including one of the cockpit scuppers that T'd to the sink drain too for me to remember exactly how it was originally. I can tell you that the ice box drain still emerges from a hole drilled into the 3/4" plywood bulkhead and I now have it leading straight to the bilge. I want to say that it was the same in our E25+ but that was just too many years ago to remember exactly. By the way, the layout in your E27, our former boat, the E25+ and our current boat an E31 are essentially all the same. This leads me to suspect that the drain in question was routed in a very similar manner with all three boats (You watch I'll be totally wrong, won't be the first time by a long shot). The bottom line is that there's a good chance that if you look again, you'll see the ice box drain emerging from the bulkhead that separates the ice box from the space under the galley sink. At worst you could use a 4" hole saw in that bulkhead to gain access to the drain which would allow you to trace the route of the hose at the same time. If doing so, take into consideration of the possible curvature of the hull there and the proximity of the box itself to the plywood to prevent possible serious damage. You could even add a plastic deck plate to the hole to give it a nice finished look. Please let us know how you progress, curious minds want to know, Glyn Judson, E31 hull #55, Marina del Rey, CA