Liquid ring pumps, selfpriming and reversible, suitable for the transfer of clear liquids, without any solid parts in suspension. The pumps are available both made of stainless steel AISI 316 and bronze. According to the construction material the pumps find good applications in several fields: Oenological field and food processing (wine, must, vinegard, oil, fruit juice, bier, sirups and pickle), dairy field (milk, whey, etc.), chemical field (acids, solvents, photographic liquids, cleaning products, ink, etc.), agriculture field (anticryptogamics, liquid fertilizers, gas oil, etc.), nautic field (sea water, sweet water, gas oil, etc.).