The ALFI brand ABDB55 shower base drain is designed for use with linear and square shower drains. This high quality PVC part quickly transforms the look and feel of your shower experience. This is a required part if purchasing a linear or square shower drain. Features • Easy to install. • Gasket Included. • Installed to a standard round shower drain in order to accommodate for square drain attachment, or for complete relocation of drain for linear/square drain installation. • Required part if purchasing a linear or square shower drain. • This part will not be visible, and is installed underneath the linear or square drain plate. • Drain plate not included. • PVC construction provides durability and resistance during hot mop sealing process.