H20617A 20617AH Cover OB Bearing with ductile iron that used for Mission 2500 Supreme Centrifugal Drilling Pumps Mission 2500 Supreme Centrifugal Pump has a semiopen impeller design that contains widetipped vanes and a more tangential circumference of the suction allowing the pump to create a smoother flow pattern when handling abrasive fluids The 2500 Supreme is available in hard iron supreme hard iron and aluminum bronze fluid ends The pumps can be unitized with electric motors diesel engines and hydraulic motors horizontal vertical or closecoupled configuration Design Features Versatile stuffing box Thick strong concentric casing with replaceable casing wear pad Casing provided with replaceable casing wear pad on 4x3x13 10x8x14 models Replaceable stuffing box cover with dual stuffing box bolts Longlife noadjustment mechanical seal available for near zero leakage Replaceable shaft sleeve Solid Frame base Labyrinth seals for maximum bearing protection Duplex angular contact bearings Full pipe diameter entrance for minimum turbulence and maximum efficiency Wide semiopen impeller creates lower axial thrust for improved bearing life All sizes feature the same power end