h2otstop products all contain a patent-pendingTemperature Actuated Flow Control (TAFR) feature certified toASSE Standard 1062. This feature is designed to reduce waterflow to a trickle when water reaches unsafe temperatures, andautomatically return to normal flow after the temperature isreduced. It still allows users to set water heater temperaturesat a safe level to avoid Legionellae contamination. Because itis an end-point device, it can be installed in apartments andother areas where there is no access to behind-the-wall piping,and accommodates installations where different areas of thehome require higher hot water temperatures.