Atoplee 1pc Stainless Steel and Plastic Air Activated Switch Button Only for Waste Disposal Material: SUS 304 stainless steel + plastic Length: about 95mm ;Caliber of trachea jack: 3mm Diameter of push button: 42.5mm;Diameter of spiral tube: 25mm Aperture of installing hole: (25~30)mm;Weight: about 33g Package Included: 1pc Air Activated Switch Button