The vats are in stainless steel of 150 to 3000 litres for the stocking and conservation at +4°C of ice- cream mix. The refrigeration is carried out by means of water circulation at +2°C produced by a special ice water vat. The ice water runs through special steel coils on the lateral surface of the vat, insulated by injected expanded polyurethane. The ice-cream mix is aged in order to guarantee a per- fect homogeneity and creaminess to the finished product.