If you are looking for professional drain backflow preventer, you should take at this item. This drain backflow preventer is made of solid material, which enjoys strong durability. It can greatly meet your practical requirement, can be used for washing machine draining. Features -Color:Assorted Color -Material:PVC -Size:11.00X9.40X7.80cm/4.32X3.69X3.07in Suitable outer diameter: 40mm, 50mm, 75mm - Unique anti-leak water seal design, effectively keeping the floor dry. - Electroplating treatment, rust-resistant and wear-resistant, ensuring long-term use for this drain backflow preventer. - Strong suction cup connector, providing a stable and reliable connection. - 90 degree design, easy to connect with sink drain , saving more space and reducing clutter. - Compatible with most roller washing machines and automatic washing machines. Package list: 1 x connector