Series MCO-SM pumps are single stage centrifugal mud pump. They are applied to barite & mineral oil based drilling mud, bentonite, salt water slurry, chemical industry, etc. Thick, strong, concentric casing with replaceable casing wear pad provides extended life over conventional volute designs. Wide semi-open impeller creates lower axial thrust for improved bearing life, and semi-open design reduces the concentration of solids behind the impeller, extending the life of the mechanical seal or packing and stuffing box. There are two mechanical seal alternative, single or double mechanical seal. This stuffing box can be configured for flush lines.