The coil heater part number is comparable to GMH1970, or it is also known as CL75-037. The coil heater inner diameter is 0.750", and the coil heater length is 3.700". The electric coil heater leads are 36" long with silicone fiberglass sleeving. The electric heating coil also comes with a ground wire and a type J thermocouple . The coil heater is made for 240 volts and 450 watts. CL1 through CL5 Lead Orientations - Click here to see the type CL5 lead orientation that this coil heater has.