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LJXH Solar Water Heater Auxiliary Electric Heating Tube Side Cover Straight Inserted 1/2" (22mm) Reserved Hole Specifications:Product Name: Solar Electric Heating TubeVoltage: 220VPower: 1500W/3000WLive Wire: Red/BrownNull Wire: BlueEarth Wire: Yellow/GreenSide Insert Diameter: 22mmMounting Method: Side-mountingTube Material: Food Grade 304 Stainless SteelHandle Material: Plasticwith Temperature Control: Yes (1500W)/No (3000W)Advantages: Intelligent technology, photoelectric dual purpose, calories conservationPackage Contents: 1 x tube Notices:1. How to ascertain the size of the electrical heating tube?1) The diameter of the bottom outer hole is 55mm, please prefer the 47mm electrical heating tube inserted on the bottom) The diameter of the lowest outer gap is 69mm, please want the 58mm electric heating tube inserted at the bottom) If the reserved hole is under the aspect of the water tank, please prefer the aspect direct plug-in electrical heating tube) If there may be the 8cm flange hole on the bottom of the water tank, please desire the flanged electrical heating tube. 2. How to put in the plug-in electrical heating tube on the bottom?1) Take out the outdated electrical heating tube or the plug in the hole;2) Apply detergent to lubricate the electrical heating tube;3) Turn the handle of the electrical heating tube and gently push it into the hole;4) The red/Brown wire is connected to the live wire, the blue wire is connected to the null wire, and the yellow/green twine is hooked up to the earth wire.