This storage / sewer hatch is designed with convenience in mind. Back plate is constructed to accept a 4-inch rigid PVC or flexible hose to create a storage area for your sewer hoses or other items. When used with our Cap #237G, this hatch can be mounted both above or below the floor and still achieve a totally contained storage system. Made of a durable plastic that won‘t fade or discolor. Paintable with no preparation needed to match any RV exterior. PVC pipe not included.