LJXH Solar Electric Heating Tube Water Heater Auxiliary Heater 47mm Bottom Inserted Anti-dry Heating with Temperature Control Specifications:Product Name: Solar Electric Heating TubeVoltage: 220VPower: 1500WLive Wire: RedNull Wire: BlueEarth Wire: Yellow/GreenBottom Insert Diameter: 47mmMounting Method: Bottom-mountingTube Material: Food Grade 304 Stainless SteelHandle Material: Plasticwith Temperature Control: YesAdvantages: Intelligent technology, photoelectric twin purpose, energy conservationPackage Contents: 1 x tube Notices:1. How to make your mind up the size of the electric heating tube?1) The diameter of the lowest outer hole is 55mm, please favor the 47mm electrical heating tube inserted at the bottom) The diameter of the lowest outer hole is 69mm, please want the 58mm electric heating tube inserted on the bottom) If the reserved hole is under the aspect of the water tank, please favor the facet direct plug-in electric heating tube) If there may be the 8cm flange gap at the backside of the water tank, please prefer the flanged electrical heating tube. 2. How to put in the plug-in electrical heating tube at the bottom?1) Take out the outdated electric heating tube or the plug within the hole;2) Apply detergent to lubricate the electric heating tube;3) Turn the handle of the electrical heating tube and gently push it into the hole;4) The purple wire is connected to the dwell wire, the blue cord is hooked up to the null wire, and the yellow/green wire is attached to the earth wire.