Subtor as a German Subtor invested company in China, offers wide range of progressive cavity pumps and components. The MM class metering progressive cavity pump has typical applications as sewage and wastewater pumping, viscous fluid pumping, chemical pumping, etc. A progressive cavity pump is a type of positive displacement pump, also known as eccentric screw pump. With German supported technology and rich marketing resources, Subtor provides quality PCP pumps with custom solutions for global clients.