I know RV tires "age out." How about sewer hoses? Ours has been sitting, unused, in its basement compartment for almost 4 years while the RV was stored outdoors--in a very hot climate. Is it time for ...
Hook it up after your black tank is completely full. Lay your head on the pipe in question and pull the lever quickly. If you feel moister it's time to get a new hose.