1.The spring mechanism of the bathroom sink drain plug works well and has good resilience. 2.Unique design: the 2-in-1 bathtub stopper and filter are washable, preventing hair and valuables from flowing out of the bathtub and avoiding unnecessary clogging. 3.Installation: Due to its simple structure and high practicability, it does not require any tools, just take out the old one and insert a new bouncing core to complete the installation. 4.Application: pop-up pressure plugs are suitable for bathrooms, sinks, kitchens, bathtub basins, laundry tubs, swimming pools, etc. 5.Applicable aperture: 33.6-40mm 6.If you have any questions about the product, please contact us, our professional customer service team will solve the problem for you as soon as possible.