1.0 gaff meets U.S. federal standard for water conservation Reliable, battery-powered sensor with 3-year battery life Standard 11-1/2” rough-in and ¾” top spud GO BLUE seals and gaskets stand up to chloramine and other chemicals, lasting 10x longer than competitors' and keeping maintenance costs to a minimum Dezincification-resistant brass alloy with a polished chrome-plated finish provides lasting toughness and durability; Tamper-proof stop cap deters vandalism; Manual override button in case of power failure