General description By blocking bad odors and insects from the pipe, this 2Pcs Shower Floor Drain Backflow Drain Center Sewer Odor Stopper is an essential addition to your kitchen or bathroom. It is designed for easy installation and effective performance. Technical specifications Suitable for dish drainer with a hole diameter between 3.7 cm and 5.2 cm 360-degree drain valve for large volume and fast drainage Anti-corrosive, acid and alkali resistant Very good sealing effect Installation Simply plug and play, with no need to remove tiles or drill.