Sink Stopper Gasket for Drain Valve and Strainer Basket We offer you 5 pieces rubber O-rings, with multiple replacements of bathtub stopper sink stoppers in your home, enough for your daily replacement needs. The sink stopper rubber gasket is an O-ring bathtub stopper gasket, the outer ring size of a single rubber gasket is about 5.4cm/2.126inch and the inner diameter is about 3.2cm/1.26inch. Great for replacing or repairing drain stoppers, strainer baskets. It is a useful kitchen tool. This pop-up stopper washer is designed with the push-up technology that stands out, just put the sink stopper rubber gasket on the push-up (pop-up) drain valve and it can work. Installation takes just seconds. Our pop-up sink replacement washer with gasket is designed to fit most types of sink stoppers and is ideal for replacing sink stopper gasket in kitchens, bathrooms, bathtubs, drains, laundry sinks and more.