This pit gasket ensures security of the pit from foreign objects entering the pit cavity. The gaskets fit neatly below the lid and are are sized to suit P6/P8/P9 telecommunications and infrastructure pits. Made from black fluted polypropylene sheet (Corflute), they are a simple but effective barrier to dirt and debris. Please note that two gaskets are required for P6 & P8 pits, and 3 gaskets are required for P9 pits.