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How to Replace Rubber Seal on Upvc Windows In this blog we're going to learn how to replace rubber seal on uPVC windows. The first thing you need to know is what type of gasket is currently installed in your window. Typically you will find that your window has either wedge gasket seal or rubber gasket seal - Or a combination of both.Bubble Gasket Seal Bubble gasket seal is installed around a window opening and around the glass. It has either a round or oval shape bubble and an arrowhead to …