brackit Heavy Duty, Waterproof, Silver Butyl Tape, Flashing Tape; 50mm x 10m; Extra Thick – For Insulation or Repairing Sealing Leaks in Roofs, Pipes, Windowsills : Amazon.co.uk: DIY & Tools
Butyl Tape - 50mm(W) x 5M(L) Waterproof, Flame Retardant, High-Temperature, Corrosion Resistant,Suitable for Roof Construction, Repair Gap Engineering and Other Engineering Operations : Amazon.co.uk: DIY & Tools
Double Sided Butyl Tape Used for Membrane Jointing, Waterproofing, Pond Liner Repair 50MM X 1.5MM X 10M | DIY at B&Q