Pneumatic Corker : The cork is inserted via a corking pin operated by a pneumatic piston the corking head is equipped with four ground and lapped jaws. Synthetic or natural corks with Ø 22, 24 26 may be used and, on request, the machines may also be equipped for corks Ø 28.The cork is inserted rapidly, in about 2 seconds, to create less pressure on the neck of the bottle.