DuPont Tyvek Wrap Caps are the recommended fastening method for DuPont Weatherization Systems. DuPont Tyvek Wrap Caps can be pneumatically applied or hand applied for greater flexibility across a number of building applications. They provide additional protection around fastener penetrations and increases fastener-holding power. DuPont Tyvek Wrap Cap staples feature a 1 inch diameter high density polyethylene with UV inhibitors cap that is engineered to distribute maximum holding power to the perimeter of the cap, reducing jobsite tear-offs.