Muzitao Sink Stopper (2 Pack) Rubber Bathtub Drain Stopper & Kitchen Sink Plug The Best Universal Sink Stopper and Travel Plug Includes 2 x sink stoppers (1 x 4.5" and 1 x 5"). Works on any drain: bath, sink, shower, tub, plastic, metal or ceramic tubs. No suction required. These sink stoppers lay flat over any drain and stay down! An absolute must for travel! It's flat and takes up barely any space in your carry-on bag. The absolute best replacement sink plug on the market.