ER Tape: Self-Fusing Silicone Tape, DIY Wrap-It/Repair-It, Black/Blue 1" x 36' x 0.020" (GL20B67100) Self-fusing tape instantly and permanently bonds to itself with no sticky adhesive or residue Easy-to-use with a thousand and one uses including automotive and electrical Makes a waterproof and airtight seal so a great solution for plumbing projects Withstands temperatures from -40 to +200 degrees Celsius and has over 400 Volts electrical insulation per mil of thickness while resisting most chemicals including fuels oils acids bases solvents and refrigerants US Army approved and made in the USA