They are rotary pumps in which the pumping action is performed by two oscillating pistons. They are therefore positive displacement volumetric, with high suction power and high volumetric efficiency. They can handle viscosities up to 200.000 cSt and temperatures up to 300ºC. They are manufactured in cast iron, bronze and stainless steel.

They are particularly suitable for liquids sensitive to agitation such as mayonnaise, jams, tomato, etc.