Pentax CM65 Range of Centrifugal Pumps, Pentax CM65-125A, CM65-125B, CM65-160A, CM65-160B, CM65-160C, CM65-200A, CM65-200B, CM65-200C, CM65-250A and CM65-250B. 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.