1.The bite valve replacement is made of high-quality silicone material, safe and BPA free, which makes it an ideal mouthpiece replacement for your water bottle. 2.These bite valve replacement adopt one-piece and self-seal design to prevent leakage, accurate size fits the water bottle well and makes your bottle more long-lasting.3.You will receive 4 pieces of silicone bite valve replacements, this quantity allows you to replace the bite valve of your water bottle and extend its service life.4.Bite valve replacement compatible with 20oz, 26oz, 30oz, 32oz Britas water bottles / filter water bottles.5.It is recommended to replace the mouthpiece replacement for brita water bottle every three months to ensure that your bottle is always in the best condition.