My UPVC double glazing & doors are 11 years old & some of the black hollow rubber seals are splitting & falling apart. The UPVC Sections were manufactured by Premier Profiles. where can I get replacement seal 'rubber' sections? These are the draught seals in the door frames not the glazing seals.

I have bought the same from ebay but not that old as you are specifying. No used material, I bought new ones from there.

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Synseal Conservatories