A pump connected to a reservoir and a cylinder of an implantable penile prosthesis includes a pump body and an inlet valve assembly. The pump body has a pump bulb connected to the pump body, where the pump bulb is operable to move fluid between the reservoir and the cylinder. The inlet valve assembly includes a valve and a tubular sleeve that provides an exit valve seat. The inlet valve assembly is disposed in an inlet channel of the pump body and operable to allow a portion of fluid to be drawn from the reservoir through the tubular sleeve and through the inlet channel to the pump bulb for delivery into the cylinder.
