Pentax CM80 Range of Centrifugal Pumps, Pentax CM80-160A, CM80-160B, CM80-160C, CM80-160D, CM80-200A and CM80-200B Pumps. Centrifugal Single Stage Monobloc Pumps Surface Mounted Pumps. Monobloc horizontal centrifugal pumps, constructed to EN 733 standards; widely used in water supplies, pressurisation and fire-fighting systems, cooling, heating, irrigation, industrial and agricultural applications; standard supply with counter-flange.