non-metallic elements for drainage of flat roofs, terraces and balconies; non-metallic snow catchers; non-metal gutters; non-metallic drainage pipes; non-metallic roof and terrace outlets; non-metallic roof and terrace outlet attachments; non-metallic accessories for roof and terrace outlets; non-metallic protecting baskets, leaf guards, and drainage rings; non-metallic sealing sleeves for pipe penetrations; non-metallic through wall outlets; non-metallic safety overflows; non-metallic retent...