This Hydroflush cleans the tank, pipe, valve, and hose of your RV's sewer system. Safely flush out your sewer hose and holding tank after dumping by sending a blast of fresh water into the waste tank to remove remaining debris. Anti-siphon valve installs on fresh water faucet to prevent contamination of fresh water system. Clear ABS plastic helps you see when the tank and hose are flushed clean. Quick-turn 90° design fits in tight spaces. Valve prevents contamination of fresh water Clear plastic lets you see when tank is clean | Valterra RV Hydro Flush 90 Degree | ABS Plastic