Zurn ZER6000PL-HET-CPM 1.28 gpf Battery Powered Automatic Sensor Flush Valve For Water Closets ZER is equipped with chloramine resistant internal seals to reduce maintenance costs. Standard valve dimensions for easy installation on construction or retrofit projects. Available in 1.1 gpf bowl systems for low water consumption achieving 31% water savings over typical 1.6 gpf bowls. Clog-resistant linear bypass diaphragm.