Designed to function like a real cow's teat, moving all the time while the calf is sucking. Micro-thin soft but durable. Teats feel natural and comfortable to the calf, almost identical to mother's. Has an opening on each side so nipple does not collapse and is leak resistant. The unique flap holds milk in the nipple. Will work with tube or gravity feeding. Especially helpful for very young calves. Nipples are screw on.
I've raised calves for over 44 yrs and these things are the Best I've ever used. No need to open or adjust for milk flow, they can be used just like they are. No inhalation Pneumonia with this nipple. They are pricey, but last a Long time. Won't use any thing else.
"Best nipple on the market"
I've been using these nipples for almost 15 years. Have never had them come apart, sounds like the previous reviewer may have had a bad batch. These have a valve in the teat to regulate flow so cleaning them religiously is a must. The rubber will eventually wear out so they will need to be replaced after some time. I raise 300+ calves a year on these! Only complaint is the price, but the New Zealand manufacturer controls this.
"Teats Fall a part"
I bought and own 6 of these buckets. The bucket work well, BUT the teats are Junk. 4 of the 6 teat to these buckets have come a part. Not torn, but the seam on the nipple/teat comes a part and the milk pours out. The was only with 6 months of use on small calves. For the price of replacements a Person would thing that They could make them with better quality. Very disappointed in the teats.