Designed with 4 in. flanged ports, 200 Series is suited for liquids and semi-solid materials with viscosities from 40/4 to 100,000/21625. Variable volume Model 200AV requires less HP by maintaining minimum pressure, adjusting displacement to discharge rate allowed. Model 200AX has large passage isolated from pumping members to link discharge port directly to suction for bypass action. With large bronze shaft bearings and oversized glands, Model 200A is suited for straight transfer work.