The Peach Teat A natural looking teat known as the next best thing to the real thing! A milk opening on each side of the nipple prevents leakage and an internal micro-thin valve stops back flow into the bucket. The valve never closes in it’s relaxed state and cannot be blocked. This is designed to act like a real cows teat, moving all the time while the calf is suckling. Peach Teats are extremely durable for long lasting performance.