a pump having a vessel with a hollow interior . an adaptor may be associated with the vessel and include an opening that facilitates selective flow of fluid relative to the interior . a piston may be slidably mounted within the vessel &# 39 ; s interior and movable relative to the adaptor . the pump may also include a piston actuator having a first actuator end and a second actuator end in which the first actuator end is operably associated with the piston . the second actuator end may extend outside the interior such that the piston actuator is configured for facilitating selectable movement of the piston within the vessel . a valve assembly selectively attachable to the adaptor to facilitate selective flow of fluid relative to the adaptor .