Protects fresh water supply from possible back flow with the 3/4" Valterra Anti-Siphon Valve.• Compatibility: HydroFlush Sewer Waste Valve Reverse Flush System• Size: 3/4 Inch• Material: Plastic• Quantity: Single Features An Internal Backflow Preventer Removable Anti-Siphon Valve To Protect Fresh Water Supply From Possible Backflow Limited 1 Year Warranty | Valterra 3/4" Anti-Siphon Valve, Removable, Plastic, Carded