This great one-way valve helps kids suck milk from the tubes on your Caprine Feeder. It keeps the milk from dropping back down the tube! Kids get a constant stream of milk even if they stop sucking momentarily. Easy to clean, the valve fits into the tube that sits in the milk. You'll need one valve for each tube of your Caprine Feeder. Also available in packs of 10 (for your Caprine Feeder), packs of 6 (for your Small Caprine Feeder) and in bulk quantities of 20 or more.