Granco manufactures a full line of unique rotary positive displacement ball type pumps. In fact, it is the only ball type design being manufactured today. The simple ball and shaft design promotes durability because the pumping mechanism “floats” in the housing with no metal to metal contact. This designs promotes years of durable and dependable service. The large rotating cavities provide slower speeds which maintains critical tolerances not seen in any other designs. Proudly made in America for over 75 years.