DuPont Tyvek Flashing Tape 4" x 75' - 1 Roll Helps protect heads and jambs of rectangular windows and doors from air and water intrusion Self adhered DuPont Flashing Tape can help reduce the risk of water damage, increase building comfort, and improve energy efficiency Engineered to withstand the rigors of the job site, including UV exposure for up to 120 days Can help keep heated and cooled air in, and exterior air out, more effectively, for improved comfort and energy efficiency