10-24-2021, 07:00 PM
#462 should have a 160 gall waste tank (combined black and gray water). A full tank will take some time to empty. Have you had this coach for some time? If not, there are TWO valves that must be open to drain the waste tank on a Newell. The (typically) air powered valve and a (typically) manual drain valve between the air powered valve and the waste tank. To drain the waste tank, both of those valves must be open. If they are open and mess is backing up into the shower there must be a plug somewhere and that is a bad thing.