NDS 533 2" x 4" White DWV/SCH40 Hub x S&D Spigot PVC Increaser/Reducer Adapter Bushing is used to connect two different pipe and fitting types and sizes. The Increaser/Reducer Adapter is made of polyvinyl chloride (PVC) and makes a Hub X Spt solvent-weld connection. Works with the Mini Channel Drain system, part of the NDS Profile Channel series, for draining light flows from pool & spa areas, concrete & paver patios, tennis courts, walkways, and driveways. Meets applicable ASTM standards. For use in non-pressurized underground sewer and drainage applications; maximum working pressure of 5 psi. Hassle-free limited lifetime warranty guarantees the NDS product is free from defects—or we’ll replace it.