The replacement rubber stoppers for Toddy and Filtron Cold Brew System (15-Pack) are essential components for keeping your cold brew system sealed and preventing leaks. Made of durable rubber, these stoppers are specifically designed to fit the Toddy and Filtron brand systems, ensuring a secure and tight seal. With a pack of 15, you'll have plenty of replacements on hand for whenever you need them. Keep your cold brew fresh and hassle-free with these reliable rubber stoppers.