MOT Type 1 Aggregate – Crushed Limestone/Granite – Driveways & PatiosProduct Overview The Professional Rot Protector Sleeve is designed for 75mm 100mm square fence posts. This heat shrink post protection sleeve effectively prevents ground line rot and decay in timber fence posts. It features a dual layer barrier system with a thermoplastic outer layer and a bitumen based inner liner, creating a watertight and airtight seal at the critical ground contact zone. Upon heating, the sleeve shrinks tightly around the post