- The PT-500 is designed for reliability in waste water and other dirty or turbulent liquids. Its unique set of features puts it in a class of its own:
+ Built-in lightning protection
+ Class 1, Div. 1/Zone 0 certification
+c hoice of patented re-usable cage or fixed, welded cage
+ field adjustable zero
+ conduit mounting threads
+ ingenious and compact vent tube filter cap