The EXCAL Fast-flow tube-delivery teat was the fore-runner of all modern calfeteria teats for group feeding of large numbers of calves. Invented by Mrs Nan Duffy, the Fast-flow internal shape creates a pump-like effect as the calf bites it. The first biting action closes the base end of the teat, and further mouth closure forces milk out through the tip. Almost the same effects as when the calf is suckling naturally. The Fast-flow calf teat takes standard 11mm o.d. plastic tubing, and should be mounted at the most ideal suckling height for the calves being reared, with the delivery tubing descending into the milk container. EXCAL non-return valves should be used at the bottom of the milk tubes to prevent back-flow. The EXCAL Fast-flow teat is fitted into a 22mm diameter drilled hole, in any plastic or metal container or remote feeding panel.