This product is a13mm or 17mm water cistern float ball cock valve piston rubber seal, specifically designed for use in cistern ball cock valves. Made in the United Kingdom, this black rubber seal is a high-quality replacement part for maintaining the functionality of your plumbing system. With its durable construction and precise measurements, this valve piston rubber seal ensures a reliable and efficient water flow in your cistern. Perfect for DIY enthusiasts or professionals in the plumbing industry, this product offers a convenient solution for any leaking or faulty valve issues. PLEASE PICK FROM THE DROP DOWN MENU WHICH SIZE AND QUANTITY YOU REQUIRE