Colour : Clear , Material : Silicone, Package Content : 15 Pcs, Size : Outer Dia - 18 mm, Thickness - 3 mm, Inner Dia Hole - 10 mm, Widely used in automobile, electrical appliance and other industry, Mechanical equipment, Automotive,Construction, Home appliance, Aviation,Office facilities and so on. Designed to allow full water flow and provide a positive shut off.