An inflatable penile prosthesis, comprising: an inflatable member; a reservoir configured to hold fluid; and a pump assembly configured to facilitate a transfer of the fluid from the reservoir to the inflatable member when the prosthesis is in an inflation mode, and facilitate a transfer of the fluid from the inflatable member to the reservoir when the prosthesis is in a deflation mode, the pump assembly including: a pump; a valve body having a first valve and a second valve and a third valve and a fourth valve, each configured as a one-way valve, and each of the valves being disposed within a fluid channel or passageway that are each fluidically coupled to the pump; wherein the valve body defines a first channel that fluidically couples the reservoir and the pump, the valve body defines a second channel that fluidically couples the reservoir and the pump, the valve body defines a third channel that fluidically couples the inflatable member and the pump, the valve body defines a fourth channel that fluidically couples the inflatable member and the pump, the first valve being disposed within the first channel and being configured to allow fluid to flow from the pump to the reservoir, the second valve being disposed within the second channel and being configured to allow fluid to flow from the reservoir to the pump, the third valve being disposed within the third channel and being configured to allow fluid to flow from the inflation member to the pump, the fourth valve being disposed within the fourth channel and being configured to allow fluid to flow from the pump to the inflation member; and a selection member defining at least one opening, hole or lumen, the selection member being movable from a first position in which it allows fluid to flow through one or more of the fluid channels or passageways to place the prosthesis in the inflation mode and a second position in which it allows fluid to flow through a different channel or passageway or a different set of channels or passageways to place the prosthesis in the deflation mode, wherein the at least one opening, hole, or lumen of the selection member is configured to be aligned with the first valve and the third valve when the selection member is in the second position and is configured to be aligned with the second valve and the fourth valve when the selection member is in the first position. an inflatable member; a reservoir configured to hold fluid; and a pump assembly configured to facilitate a transfer of the fluid from the reservoir to the inflatable member when the prosthesis is in an inflation mode, and facilitate a transfer of the fluid from the inflatable member to the reservoir when the prosthesis is in a deflation mode, the pump assembly including: a pump; a valve body having a first valve and a second valve and a third valve and a fourth valve, each configured as a one-way valve, and each of the valves being disposed within a fluid channel or passageway that are each fluidically coupled to the pump; wherein the valve body defines a first channel that fluidically couples the reservoir and the pump, a pump; a valve body having a first valve and a second valve and a third valve and a fourth valve, each configured as a one-way valve, and each of the valves being disposed within a fluid channel or passageway that are each fluidically coupled to the pump; wherein the valve body defines a first channel that fluidically couples the reservoir and the pump, the valve body defines a second channel that fluidically couples the reservoir and the pump, the valve body defines a third channel that fluidically couples the inflatable member and the pump, the valve body defines a fourth channel that fluidically couples the inflatable member and the pump, the first valve being disposed within the first channel and being configured to allow fluid to flow from the pump to the reservoir, the second valve being disposed within the second channel and being configured to allow fluid to flow from the reservoir to the pump, the third valve being disposed within the third channel and being configured to allow fluid to flow from the inflation member to the pump, the fourth valve being disposed within the fourth channel and being configured to allow fluid to flow from the pump to the inflation member; and a selection member defining at least one opening, hole or lumen, the selection member being movable from a first position in which it allows fluid to flow through one or more of the fluid channels or passageways to place the prosthesis in the inflation mode and a second position in which it allows fluid to flow through a different channel or passageway or a different set of channels or passageways to place the prosthesis in the deflation mode, wherein the at least one opening, hole, or lumen of the selection member is configured to be aligned with the first valve and the third valve when the selection member is in the second position and is configured to be aligned with the second valve and the fourth valve when the selection member is in the first position.