My Pearson 303 does not have a shower sump, I want to install one I am leaning towards an Attwood 4141 if it fits in my bilge. I think I will pump out at the transom. My question is do I need a vented loop or a loop in the discharge hose before the through hull or run the hose straight to the thru hull? Being that I don't have to worry about heeling over on this type of install I don't think I need any loop. If the transom ends up low enough in the water to allow water to enter the shower sump discharge hose I think I will have bigger problems than the shower sump! Any good ideas. Thanks