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There are fewer uPVC window seal types than the product listings suggest, and once you know which family you are looking at, the rest falls into place quickly. Nearly every gasket on a UK uPVC window or door belongs to one of four groups, and each one does a specific job. It sounds obvious, but the reason seals get ordered wrongly is that they are easy to tell apart end-on and almost impossible to tell apart from the front. This guide gives you the distinctions that matter. The two jobs a seal d …