All Categories > Window Weatherstrips > Window Weatherstrip - Double Hung Windows - Series No. 20 - Double Groove Type      Printable Page     Email This Page     Save To Favorites Window Weatherstrip - Double Hung Windows - Series No. 20 - Double Groove Type A highly efficient type for the better class work. Features: this equipment gives double contact at sash cord borings and on pulley stiles. The pulley stile strips are attached with screws, permitting easy removal. After sash are squared, variation in alignment is corrected by packing out the No. 11 type strip with waterproofing Ruberoid strips making the pulley stile members parallel. How to Specify: all double hung windows shall be equipped with Metal Weather Strips, Series No. 20 equipment, with heavy duty 12 gauge sill member and double tongue side members, all zinc (or cold rolled bronze) in accordance with manufacturer’s standards. Stock sizes; 32",36",42",48",60",64",72",86",96" plus 1/2"