silica gel circle for solar water heater Type: Solar Water Heater Parts Model Number: 20,25,47,58 mm Style: silica gel circ silica circle for solar water heaterProducts feature1,made of 100% silicone material 2,nontoxic, odorless, ... and a long service life. Product attributesNamesilica gel circleFull specifications20,25,32,47,58,70mmProduct size20,25,47,58mmFlanging Height11mm,12mmPackage ...