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There's only one in the bottom of the jug, and I admit the plastic did begin to leak after about six months. Pretty easy to get another empty milk jug and make a new one, if that size was perfect. But I re-used the nipple in a harder plastic Rubbermaid half gallon juice pitcher. The kinda skinny ones that fit in the fridge door? Those. Easier to fill, too - simply lift the spout whatsit on its hinge and pour in more water. I did have to cut a bit of a notch in the lip where it would normally seal, to allow the air to enter. There has to be holes in the top or other venting, otherwise vacuum stops the water from coming out of the nipple. Forget to do that, and you'll have some frustrated and thirsty chickens!