Abstract: A manually operated pump exhibiting numerous improvement over existing such pumps is described. The pump can include a cylinder that is removeably mounted to a molded valve box of unitary construction. The valve box can feature a valve plate covering a valve chamber and housing an inlet valve and an outlet valve. In some instances, the pump includes a molded piston of unitary construction to which a pair of opposing piston cups is mounted. In some cases, the pump includes a filler cap forming an inlet adapted to deliver a priming fluid into the cylinder. In some cases, the pump includes a stopper cap adapted to prevent a pump shaft from being fully pulled out of the cylinder.

Abstract: Improved systems and methods for cleaning a filter are described, including apparatuses that include a built-in mechanism for cleaning a filter screen. The system can include a brush mounted in contact with a filter screen, adapted so that the brush can be moved to clean the filter screen. In some versions, the brush rotates with an axis of rotation perpendicular to a plane defined by a substantially planar filter screen. In other versions, the brush is adapted to be moved by a gravitational force along a surface of a filter screen upon removal of a pump housing from a pump well. In still other versions, a substantially cylindrical brush is mounted nested with a substantially semi-cylindrical filter screen, and the brush can be rotated while in contact with the filter screen and with an axis of rotation aligned with a longitudinal axis of the filter screen.

Abstract: Improved systems and methods for cleaning a filter are described, including apparatuses that include a built-in mechanism for cleaning a filter screen. The system can include a brush mounted in contact with a filter screen, adapted so that the brush can be moved to clean the filter screen. In some versions, the brush rotates with an axis of rotation perpendicular to a plane defined by a substantially planar filter screen. In other versions, the brush is adapted to be moved by a gravitational force along a surface of a filter screen upon removal of a pump housing from a pump well. In still other versions, a substantially cylindrical brush is mounted nested with a substantially semi-cylindrical filter screen, and the brush can be rotated while in contact with the filter screen and with an axis of rotation aligned with a longitudinal axis of the filter screen.

Abstract: A manually operated pump exhibiting numerous improvement over existing such pumps is described. The pump can include a cylinder that is removeably mounted to a molded valve box of unitary construction. The valve box can feature a valve plate covering a valve chamber and housing an inlet valve and an outlet valve. In some instances, the pump includes a molded piston of unitary construction to which a pair of opposing piston cups is mounted. In some cases, the pump includes a filler cap forming an inlet adapted to deliver a priming fluid into the cylinder. In some cases, the pump includes a stopper cap adapted to prevent a pump shaft from being fully pulled out of the cylinder.