An apparatus comprising: a casing having a main bore, a first port, a second port, a third port, a fourth port and a fifth port; a first deflecting member; a second deflecting member; a force generating member coupled to the first deflecting member and the second deflecting member and configured to cause movement of the first deflecting member and the second deflecting member; wherein the first port, the second port and the third port each comprises a hole in the casing that is continuous with the main bore and has a center-line axis at a transverse angle relative to the longitudinal axis of the main bore; wherein the force generating member is disposed at a proximal end of the main bore; wherein the third port is disposed at a position closer to the proximal end of the main bore relative to the position of the first port and at a position further away from the proximal end of the main bore relative to the position of the second port; wherein the fourth port is disposed at the proximal end of the main bore; wherein the fifth port is disposed at a distal end of the main bore; wherein the first deflecting member is disposed between the distal end of the main bore and the first port and the second deflecting member is disposed between the third port and the second port in a first state, during which the third port and the first port are fluidly connected with each other, and the second port and the fourth port are fluidly connected with each other, and the fifth port is closed by the first deflecting member; wherein the first deflecting member is disposed between the first port and the third port and the second deflecting member is disposed between the second port and the proximal end of the main bore in a second state, during which the fourth port is closed by the second deflecting member, and the second port and the third port are fluidly connected with each other, and the first port and the fifth port are fluidly connected with each other, wherein the direction of fluid flow through the third port producible by a fluid flow generating device is reversible by a coordinated movement of the first deflecting member and the second deflecting member generated by the force generating member. a casing having a main bore, a first port, a second port, a third port, a fourth port and a fifth port; a first deflecting member; a second deflecting member; a force generating member coupled to the first deflecting member and the second deflecting member and configured to cause movement of the first deflecting member and the second deflecting member; wherein the first port, the second port and the third port each comprises a hole in the casing that is continuous with the main bore and has a center-line axis at a transverse angle relative to the longitudinal axis of the main bore; wherein the force generating member is disposed at a proximal end of the main bore; wherein the third port is disposed at a position closer to the proximal end of the main bore relative to the position of the first port and at a position further away from the proximal end of the main bore relative to the position of the second port; wherein the fourth port is disposed at the proximal end of the main bore; wherein the fifth port is disposed at a distal end of the main bore; wherein the first deflecting member is disposed between the distal end of the main bore and the first port and the second deflecting member is disposed between the third port and the second port in a first state, during which the third port and the first port are fluidly connected with each other, and the second port and the fourth port are fluidly connected with each other, and the fifth port is closed by the first deflecting member; wherein the first deflecting member is disposed between the first port and the third port and the second deflecting member is disposed between the second port and the proximal end of the main bore in a second state, during which the fourth port is closed by the second deflecting member, and the second port and the third port are fluidly connected with each other, and the first port and the fifth port are fluidly connected with each other, wherein the direction of fluid flow through the third port producible by a fluid flow generating device is reversible by a coordinated movement of the first deflecting member and the second deflecting member generated by the force generating member.