Invented in 1979 by the late, Jack Pritchard himself, these unique nipples have a hollow cone-shape that provides a choice of feeding rates.  The valve allows air to be freely admitted, but prevents milk from being squirted out the air vent. No mess, no waste. For a fast flow, cut off complete tip so weaker lambs can drink.  For a slower flow, snip a little off the tip. 

Easily screws on most size bottles including the 2 liter plastic pop bottle.  
Veri-speed nipple can be cut with scissors to adjust feeding rate.
Nipple cannot be pulled from bottle. 
Made in New Zealand.