FSD Bifold Door Timber Insert B379 Bubble Gasket Seal 6Mtr

The gasket has a ribbed v shaped insert to the bottom which is purpose made to push snugly into a purpose made groove machined into the timber profile to allow it to fit snugly and securely in place to ensure the gasket is held upright so the folding leafs provide a tight weather seal to the bifold doors.

eBay