We use the best seal that’s available on the market to us. The old seal is rubber and perishes over time (see image) which allows air and noise to come through your window, our Q-lon seal ( on the right of the picture) has a 99% memory recovery and retains its shape year after year, which means the quality of the seal on your window is never compromised.
The Q-lon Gasket also gives the best acoustic and thermal performance, resulting in a window which reduces noise pollution levels whilst providing protection from Draughts its goes back in the original groove of your window also available for Doors.