The Homesmiths G.I Flat Washer 6mm is the ideal washer which fits perfectly into pistons, bends and taps to regulate the flow of water and not allow any leakage. The pistons are crafted out of the highest grade of stainless steel, and are deliberately made to be light so as to allow easy adjustment by movement. The washers are completely rust free and resistant to prolonged exposure to water. The washers is a perfect fit for the most common plungers and pistons using in home and commercial plumbing setups. .(1)Can be used on most commercially available pistons and plungers (2)Easily moveable and adjustable (3)The washers are quite durable (4)Good resistance to rust.