WIKA TI.30 Stainless Steel 304 Process Grade Resettable Bi-Metal Thermometer, 3" Dial, 50/500 Degrees F/C, 9" Stem, 1/2"NPT Connection, Back Mount Application: suitable for fluid medium which does not corrode 304 stainless steel Process grade design, 7 year material / workmanship warranty Stainless steel case and wetted parts Back connection with external reset NEMA 4X / IP 65 Weatherproof