Hello, Been having a discussion with a friend. I am doing some work on my 28ft O'Day. Will be replacing the clam shell vents on the stern. Which leeds me to my question. The expandable hose needs replacing, my friend says don't bother. Now I have had gas engine boats, and understand the blowers and ventilation importance excreta. However my little Yanmar diesel? Do you think I can skip replacing the vent hoses? Thank you for these forums, love them. Michael