Viper 2 inch x 90 ft Double Bond Butyl TapeViper II Double Bond Butyl Tape 2 in x 90 ft Double Sided Butyl Tape Viper II Double Bond Butyl Tape is a professional grade double sided butyl adhesive tape built for creating strong, airtight, moisture resistant bonds in demanding construction environments. With aggressive adhesion on both sides, it helps form a watertight seal between overlapping seams and between vapor barriers and common structural surfaces. In simple terms: This is a double