To filter out harmful substances, convert them into something non-hazardous or prevent them from being produced in the first place, you need sophisticated, smart modules made up of valves, pumps, and electronics. Thomas is developing and manufacturing systems that, for instance, can detect the tiniest leaks in a tank as well as pump systems equipped with a communication interface and diagnostics functionality. These systems can control the temperature of exhaust gases in order to meet increasingly stringent limits on emissions.