For calf reares who prefer to use standard nursing or hand-held bottles with threaded tops, Peat Teats Nurser Cap is perfect. This screw on cap features a vent and a patented Peach Teat nipple and fits any two quart bottle. The Peach Teat nipple works just like a cow's udder, allowing a calf to suckle more intensely, stimulating saliva and improving PH levels in the stomach for better digestion. | Peach Teats Nurser Cap