silica circle for solar water heater Type: Solar Water Heater Parts Model Number: 20,25,47,58 mm Style: silica gel circle silica circle for solar water heaterProducts feature1,made of 100% silicone material 2,nontoxic, odorless, non-corrosive ,antioxidative3,Each product have good quality and a long service life.Product attributesNamesilica gel circleFull specifications20,25,32,47,58,70mmProduct ...