Mapei PP Level Duo Maxi Pedestal Head Adjustment Key for 4mm jointsModular System for Raised Exterior Floors PP level DUO MAXI System is ideal for transforming unused patios and rooftops into desirable living spaces. The pedestal system raises elevates the pavers and levels the floor by compensating for a sloped substrate up to 5%, thanks to the self leveling head. This modular system allows for easy maintenance and access to conduits, waterproofing and drainage systems beneath the pavers. The resulting open joints