Made of heavy duty cast iron, suitable for hot mop shower installations.cUPC Certified, can be used for new construction and commercial peroperties.Easy to Install, detailed PDF installation instructions available.This part will not be visible as it is installed underneath the linear or square drain plate.Similar drain base made of PVC plastic also available as model # ABDB55Compatible with all ALFI brand shower drains or any brand as long as it’s a standard size drain diameter and slip in method not screw in.