FOR KIDS' BOTTLES: The rubber seal in a set of 2 is suitable for use with the KBT screw top from SIGG, and ensures that the bottle remains reliably leak-proof. SPARE PART: The SIGG bottles are so long-lasting that the rubber gasket may need replacement more quickly than the bottle itself. Replacement is quick and easy. LEAK-PROOF CAP: Thanks to this practical and easily replaced rubber seal, the bottle cap of any KBT thermos flask can quickly be made leak-proof again. SAFE DRINKING: The rubber seal replacement for SIGG bottles is entirely BPA-free and does not contain pollutants such as oestrogenic substances or phthalates. DELIVERY & DETAILS: SIGG bottle seal for KBT top, leak-proof bottle cap gasket, dishwasher-safe, pollutant- and BPA-free, Swiss design, item number: 7815.31