is wedge gasket that came with window,is it curved on one side with a lip on other side if so put the curve against glass then the smallest edge going in to the gap inbetween glass and frame.it just pushes in the gap between the glass and frame,sometimes its a bit tight and you can use a bit of washing up liquid to help it on its way.hope this helps
shaun www.sdwupvcrepair.co.uk
February 2008
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