2" PVC Drain Line Connector. It's a connects shower receptor or drain adapter to PVC drain line. Top threads into tail. Gaskets rest on tail flange when threading top to tail. Polyethylene gasket allows tail to turn easily; rubber gasket seals connection. Suitable for a maximum water flow rate of 6 to 7 gallons/minute; consult a professional plumber for an accurate calculation of drainage requirements; a typical shower head uses 1.5 to 2.5 gallons/minute.