https://www.jewson.co.uk/p/bostik-flashband-self-adhesive-flashing-tape-10m-x-300mm-grey-RFFGE512
Bostik Flashband Flashing Tape 10M x 300mm Grey
Flashband is a self-adhesive sealing bitumen strip which bonds instantly to provide a permanent watertight seal in all climates.
flashing tapebostikflashbandxgrey