Hubbell - P65 Replacement Probe; Sensor. 1/4" X 2-3/4" PROBE WITH O-RING, 22" CABLE WITH COMPUTER PLUG. THIS IS NOW THE SENSOR AND CABLE ONLY. IT DOES NOT INCLUDE THE METAL THERMOWELL THAT FITS INTO THE TANK. THE METAL THERMOWELL IS GENERALLY NOT NEEDED. IF CUST NEED THE WHOLE THERMOWELL PROBE ASSY, ORDER "P65 WELL" HUBBEL BOOSTER