Read the article "Replacing Hoses"
in the Head Mistress forum reference library. You may also find some useful info in the article "Installing a Head and Holding Tank."Before taking anything apart, wash out the system thoroughly with detergent and water--no bleach, it won't do any good. Follow that with a couple of gallons of undiluted white vinegar and wait an hour or two. It may not get rid of all the odor, but it'll knock it down enough to make the job a lot less unpleasant.If you don't ever want to do this again, your replacement 1.5" hose should be SeaLand "OdorSafe" brand...the only one that's proven to be just about bullet-proof when it comes to odor permeation.