Camco 39144 Easy Slip Sewer Elbow & 4-in-1 Adapter Securely connects sewer hose to dump station Patented spin-lock rings for effortless, secure and airtight hose connection Adapter fits into 3 inch slip or 3, 3.5 and 4 inch threaded pipe Components separate for storage in a 4 inch bumper Larger inside diameter for faster dumping