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Corrapol®-BT Rock n Lock wall flashing is a completely unique aluminium side flashing for use with corrugated sheets where the side is against a wall. Simply Rock n Lock the side flashing onto the end corrugation of Corrapol®-BT sheets to secure, allowing for incredibly fast and easy installation. Corrapol®-BT 'Rock n' Lock' is extruded from aluminium, giving maximum longevity and superior protection for Corrapol®-BT sheets.