Plumb Craft Waxman 7030500N Perfect Flush Adjustable Anti-Siphon: * Prevents toilet water from backing up into drinking water * Quiet * Exclusive 2 piece seal is composed of the highest quality compounds * Uses space age plastic to provide a more durable longer lasting product * Patented after installation height adjustment allows for the height to be adjusted from 9" to 14", ensures you will have the right amount of water for a powerful flush * Plumbing code approved * Engineered to outlast other valves * Limited 7-year warranty * Carded