The Original Safety Siphon's 1/2 inch multi-purpose check valve is made from 100% pure copper and is lead free. The check valve easily attaches to a 1/2 inch ID hose and its patented self priming design can be utilized to siphon all types of liquids, making this product perfect for homebrewing and wine making. The valve contains a glass ball and stainless steel spring which produce a flow rate of 3.5 gallons per minute and prevents the backflow of liquids. Siphon gas, water, home brew, wine, oil and more. Proudly made and manufactured in the USA.