304 stainless steel cover with ABS thread plug ensures corrosion resistance and extended durability. Tool-free installation design simplifies setup process - simply remove existing stopper and secure through sink ledge or counter hole. Universal compatibility works with standard garbage disposers, swimming pool pumps, outdoor equipment, and automotive systems. Multi-functional control button operates disposers, massage tubs, and hydraulic machinery with water-resistant performance. Pre-installation measurement guide: Confirm 1.5" diameter sink hole compatibility before purchase. Package includes choice of air switch unit or complete kit with reinforced 18" PVC hose assembly. Dimensional tolerance allows 3mm variation for customized sink configurations. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia