SW-150White Free Standing Solid Surface Stone Resin BathtubMade in the UK. This bathtub comes with: A complimentary pop-up drain (1 3/4" threading). Does NOT include any additional piping. All of our bathtubs come equipped with an overflow. The overflow is built integral to the body of the bathtub and leads down to the drain assembly. There is only one rough-in waste pipe necessary to drain both the overflow and drain assembly (no visible piping). Please ensure that all of the seals are tightened properly to prevent leaks before completing installation.