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On a manually operated reciprocating liquid pump, comprising a plunger mounted for reciprocating movement between charge and discharge positions in a pump housing, a lock mechanism on the pump selectively locks the plunger in its charge and discharge positions relative to the pump housing. Seals are

On a manually operated reciprocating liquid pump, comprising a plunger mounted for reciprocating movement between charge and discharge positions in a pump housing, a lock mechanism on the pump selectively locks the plunger in its charge and discharge positions relative to the pump housing. Seals are also provided that prevent leakage through the pump when the plunger is in its charge and discharge positions.

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[ What is claimed is:] [1.] A manually operable reciprocating liquid pump comprising:a pump housing having a pump chamber;a piston mounted in the pump chamber for reciprocating movement therein between a discharge position and a charge position of the piston in the pump chamber;a piston rod connecte

[ What is claimed is:] [1.] A manually operable reciprocating liquid pump comprising:a pump housing having a pump chamber;a piston mounted in the pump chamber for reciprocating movement therein between a discharge position and a charge position of the piston in the pump chamber;a piston rod connected to the piston for moving the piston in the pump chamber, the piston rod having a discharge shoulder and a charge shoulder spaced from each other on the piston rod; and,a lock on the pump housing that is selectively operable to engage with the discharge shoulder and lock the piston in the discharge position in the pump chamber, and engage with the charge shoulder and lock the piston in the charge position in the pump chamber.