Designed to be used in special application fields, the pumps are manufactured using selected materials suitable to ensure high performance and durability. Piusi 5.5:1 Pro+Silent air-operated oil pumps are especially suitable for transferring medium viscosity oil over short and medium viscosity oil over medium and long distances. Featuring a sound proof protective structure, the pumps are equipped with a pneumatic exchanger and a three-stage air discharging system which, combined with the absence of reciprocating mechanical parts subject to breaks, ensure low operating noise (just 77 DB) and long working life. The double effect grants enhanced efficiency and reduced air consumption. Available in different lengths, all the pumps are all the pumps are also supplied with a threaded bang + adaptor suitable to ensure stable mounting on oil drums or the wall bracket.