solar water heater parts tube ring made of 100% silicone material nontoxic, odorless, non-corrosive antioxidative, dust-proof SHEET 1solar water heater parts(tube ... ( not less than 15 years) etc.Tube Specification47,58mmDiameter of Water Tank Port53,63mmMaterialSiliconFlanging Height4/4.5mmPackage1000pcs/ctnColorWhite/ ... .18 mg/m3Max Working Temperature260°C solar water heater parts(tube ring)