Check the listing for details. Dover Immersible electrical Heating Element Sensor Water Container 240V 4000W. Condition: New. Listed at 29.75 USD. For Sale Are 11 New Dover Electrical Heating Element/sensor.the Part Number is 8851.the Item Specs Say the Threads Are 1.25" However I Measure 1.5". You Will Get All 11 as Shown With Your Order. The NSN Number is 4540-00-421-9661.here Are the Specs: AALXMounting Method StyleScrew plug or bushing type mounting facilityAAQLIII Body StyleTubular, screw typeAARATerminal Quantity2ABHPOverall Length15.500 inches nominalABHSEffective Heating Length13.500 inches nominalABJAElement Radiation SpectrumNoninfraredABJSElement Connection StyleTerminal screwABKPMounting Facility Length0.688 inches nominalABNRHeat Quantity1ABRYLength13.500 inches nominalAZQHMaximum Wattage Rating in Watts4000.0 single voltageBHHKElement Quantity1CQJXNominal Thread Size0.164 inches screwCQJXNominal Thread Size1.250 inches mounting facilityCQRNThread Quantity11.5 per inch mounting facilityCQRNThread Quantity32.0 per inch screwCSBHVoltage in Volts and Current Type240.0 ac single voltageFAAZPhaseSingle single voltageMATTMaterialCopper alloy sheathTHSDThread Series DesignatorNpt mounting facilityTHSDThread Series DesignatorUnc screwIf You Have Any Questions, Please Feel Free to Call Me at . You Will Not Be Disappointed. My Feedback Speaks for Itself. If You Have Any Questions Please Email Me and Check Out the Other Items I Have for Sale. If You Have Problems With Your Order, Please Contact Me Before Leaving Feedback. Thanks, Mark