A drug delivery device comprising a reservoir for storing a fluid such as a liquid drug or a therapeutic agent; a fluid path component such as a cannula which is configured to be coupled to a patient; and a pump system comprising a piston pump block and a first piston configured to move within a first piston pump chamber; the pump system comprises a first septum positioned within the piston pump block; a second septum positioned within the piston pump block and aligned with the first septum; wherein the first piston and the first piston pump chamber are positioned on a first side of the first and second septa, and wherein the first and second septa (310; 312) are positioned into open areas of the piston pump block; a second piston configured to move within a second piston pump chamber, the second piston and the second piston pump chamber positioned on a second, opposite side of the first and second septa (310; 312); a tube component positioned through the piston pump block, the first septum, and the second septum, and positioned between the first and second pistons (208; 210) and the first and second piston pump chambers (402; 404), wherein the tube component comprises a first side port, a second side port, and a center plug positioned between the first and second side ports (410; 412), the first side port coupled to an inlet component portion of the tube component and the second side port coupled to an outlet component portion of the tube component, wherein the center plug is installed into the tube component as a piece separate to the tube component, wherein the center plug is configured to separate the inlet and outlet component portions to prevent the fluid from flowing directly between the inlet and outlet component portions, wherein the tube component can be selectively moved to couple the first side port to the first piston pump chamber and the second side port to the second piston pump chamber or to couple the first side port to the second piston pump chamber and the second side port to the first piston pump chamber, wherein the first and second pistons (208; 210) can be selectively moved to draw in a fluid to the first piston pump chamber from the inlet component portion and to expel the fluid from the second piston pump chamber through the outlet component portion when the first side port is coupled to the first piston pump chamber and the second side port is coupled to the second piston pump chamber or to draw in the fluid to the second piston pump chamber and to expel the fluid from the first piston pump chamber when the first side port is coupled to the second piston pump chamber and the second side port is coupled to the first piston pump chamber. a reservoir for storing a fluid such as a liquid drug or a therapeutic agent; a fluid path component such as a cannula which is configured to be coupled to a patient; and a pump system comprising a piston pump block and a first piston configured to move within a first piston pump chamber; the pump system comprises a first septum positioned within the piston pump block; a second septum positioned within the piston pump block and aligned with the first septum; wherein the first piston and the first piston pump chamber are positioned on a first side of the first and second septa, and wherein the first and second septa (310; 312) are positioned into open areas of the piston pump block; a second piston configured to move within a second piston pump chamber, the second piston and the second piston pump chamber positioned on a second, opposite side of the first and second septa (310; 312); a tube component positioned through the piston pump block, the first septum, and the second septum, and positioned between the first and second pistons (208; 210) and the first and second piston pump chambers (402; 404), wherein the tube component comprises a first side port, a second side port, and a center plug positioned between the first and second side ports (410; 412), the first side port coupled to an inlet component portion of the tube component and the second side port coupled to an outlet component portion of the tube component, wherein the center plug is installed into the tube component as a piece separate to the tube component, wherein the center plug is configured to separate the inlet and outlet component portions to prevent the fluid from flowing directly between the inlet and outlet component portions, wherein the tube component can be selectively moved to couple the first side port to the first piston pump chamber and the second side port to the second piston pump chamber or to couple the first side port to the second piston pump chamber and the second side port to the first piston pump chamber, wherein the first and second pistons (208; 210) can be selectively moved to draw in a fluid to the first piston pump chamber from the inlet component portion and to expel the fluid from the second piston pump chamber through the outlet component portion when the first side port is coupled to the first piston pump chamber and the second side port is coupled to the second piston pump chamber or to draw in the fluid to the second piston pump chamber and to expel the fluid from the first piston pump chamber when the first side port is coupled to the second piston pump chamber and the second side port is coupled to the first piston pump chamber.