I haven't fully replaced mine, although I did replace a section of it where the hose attaches to the pump on my 39. When I purchased the boat, there were two pumps float switches located in the bilge directly forward of the companionway, and two hoses that run to port through a hole, under the cabin sole and into the port aft cabin locker where they discharge. It would be tricky to access a large portion of the run, the best solution I can think of would be to utilize a messenger line pulled through by the old hose to pull a new hose through.