Have a Xplorer Class B. It has a Throford (spelling) recirculation toilet. Believe same on some boats. You put deoderant stuff in and 5 gallons water. Small tank under toilet with site glass indicates charged. When site glass indicates full. You pull handel under toilet inside which drains interion tank. Then outside and hook up drain hose and pull gate valve like normal camper. Anyway, I have a leak under toilet inside. Anyone have any ideas what's wrong and how to fix?