TURBULENT WATERSMAD4520 flush submersible line of non-clogging, hydrostatic pressure level sensors monitors viscous materials and/or turbulent conditions within a vessel. They are constructed of 316L and PCDF to withstand tough environments such as sewage lift stations, food tanks and viscous media applications. When used with an approved barrier, the sensors are approved to UL/cUL913 Class 1 Division 1 IS, Groups C and D. Madison ; 203/488-4477; www.madisonco.com