3pcs Bathroom/Kitchen/Washing Machine Pipe Odor-Proof Expandable Drain Rings - Washing Machine And Kitchen/Bathroom Accessories, Bathroom Sink Plugs, Leak-Proof And Odor-Proof Sealing Rings (Black/Blue), Random Packaging, Plug Lining, Bathroom Accessories, Kitchen Drain Pipes. These Sealing Rings Provide Dual Protection Against Leaks And Odors. The Back Design Fits Tightly To The Pipe, Effectively Preventing Odor Backflow And Eliminating The Risk Of Leakage.