The glass of the predecessor began after several years of use suddenly to crumble from the center. Since we use our two major wool-pans and the lid frequently and put them in the oven, we have accepted as normal wear and tear. Not so nice with these covers is that when flushing the water runs into the handle (and probably the Water alls that swims in the rinse water) and can not be removed again. As with all glass covers you should not wait too long with drying after rinsing, because you'll no longer get clear and shiny glass.
