The A20T-250-4-1/2 Temperature Swichgage has a polycarbonate case and O-ring seals. This diaphragm-actuated, 2" temperature-indicating gage has a built-in electrical switch for tripping alarms and/or shutdown devices. This model has a polished stainless steel bezel, a 4 foot capillary length, a temperature range from 130-250°F (54-121°C), and standard 1/2-14 NPT threading.