Geotextile Double-Sided Butyl Jointing Tape 50mm x 20m | RecessedManholeCovers.co.uk
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