A. [Design] The water tank filter umbrella has a double - layer design (inner and outer). It shows good corrosion resistance, is relatively easy to clean, is not prone to falling off, and is waterproof. B. The sink strainer is made of stainless steel and PVC. It resists rust and corrosion and is relatively easy to clean. C. Installation is relatively easy as there's no need to paste Teflon tape, gaskets or screw bolts on the top and bottom of the sink. D. The drain strainer is suitable for sinks with a diameter ranging from 110 mm to 114 mm. A recommended range of sink diameter is 83 - 90 mm. Please note the diameters of the sink filter plug and its rubber ring. E. The sink drain assembly includes a strainer and a plug. It can collect food residues and perform a filtering function to help avoid pipe blockages. It can also be used as a plug to hold water in the kitchen sink.