Pneumatic press Willmes Sigma 4 electronically controlled built entirely of stainless steel AISI 304 swivel arm with control terminal, tank closed with pneumatically operated door. axial load with pressure control. entirely inertizzabile machine with nitrogen. external compressed air supply, hot wort 330 liters, UCE control - electronic control CPU 314. This machine is suitable for machining all kinds of grapes by reducing the degree of oxidation of the musts. Drain pan must airtight probe for automatic operation of a pressure relief valve pump. evacuation marc sheets both sides. tank volume 3,900 liters.