3/8 INCH DIA X 2 7/8 INCH L COPPER BULB AND CAPILLARY TYPE; SPDT CONTACT CONFIGURATION; 1/2 INCH NPT CONNECTION TYPE; 0.25 AMPERE AT 0.25 TO 12 VDC CONTACT RATING; UL, CSA APPROVAL; LIQUID BOILER, TANK APPLICATION; 100 TO 240 DEG F TEMPERATURE RANGE