Pritchard Teat Nipple, Screw On
Specially designed for orphaned lambs. Shaped like a ewe's nipple. The metal leak-proof flutter valve inside allows air to flow in smoothly but controls milk flow and prevents collapse.
Slice the tip with a razor or scissors to create the appropriate opening size. Screws on to most plastic pop/soda bottles.
These are the original Pritchard nipples from New Zealand.