Blueline Universal Elbow securely fits most RV park sewer openings without requiring additional adapters. Screws into threaded openings and pushes into non-threaded openings. Solid, one-piece construction prevents separation, providing a secure, leak-free connection. Allows for a simple, secure “push-on” connection to Blueline Ultimate Sewer Hoses without the need for clamps. Also connects to standard sewer hoses