These probes are perfect for use with corrosive liquids and in plastic vessels. Made with G1 1/2 A parallel or 1 1/2-inch NPG tapered threads plus flanges that have DIN and ANSI standards from DN 40 to 200, PN 16 or 40, ANSI 1 1/2 to 4-inches and 150 to 300 psi, they are very useful.The EW 11 Z electronic insert may also be added to make the process of monitoring the unit easier to manage when a Nivotester FTW325 unit is added. These are perfect for many hazardous spaces, waste water plants and even in situations where the threat of an overspill may be prevalent, and protect more items and last for years to come.