A piston assembly, comprising: a piston rod comprising a shoulder, a first land and a second land disposed between opposing axial first and second ends of the piston rod; and a piston disposed on the piston rod, the piston comprising: a frame end cap defining a through-bore for receiving the piston rod, the frame end cap forming a first end of the piston, an outer end cap defining a through-bore for receiving the piston rod, the outer end cap forming a second end of the piston, and a center support defining a through-bore for receiving the piston rod, the center support disposed between the frame end cap and the outer end cap, wherein an outer surface of the piston rod and an inner circumferential surface of the center support define a radial gap therebetween; wherein the frame end cap is disposed proximal the shoulder of the piston rod, and the outer end cap is disposed adjacent the second end of the piston rod; wherein the center support includes a sleeve, wherein the piston is disposed on the piston rod between the shoulder and the second end; wherein an inner circumferential surface of the frame end cap defines a circumferential recess; wherein a collar is positioned between the shoulder of the piston rod and the frame end cap of the piston, the collar configured to expand into a circumferential indention of the piston rod and a circumferential inset of the piston, characterized in that the circumferential recess of the inner circumferential surface of the frame end cap is configured to receive the sleeve of the center support. a piston rod comprising a shoulder, a first land and a second land disposed between opposing axial first and second ends of the piston rod; and a piston disposed on the piston rod, the piston comprising: a frame end cap defining a through-bore for receiving the piston rod, the frame end cap forming a first end of the piston, an outer end cap defining a through-bore for receiving the piston rod, the outer end cap forming a second end of the piston, and a center support defining a through-bore for receiving the piston rod, the center support disposed between the frame end cap and the outer end cap, wherein an outer surface of the piston rod and an inner circumferential surface of the center support define a radial gap therebetween; wherein the frame end cap is disposed proximal the shoulder of the piston rod, and the outer end cap is disposed adjacent the second end of the piston rod; wherein the center support includes a sleeve, wherein the piston is disposed on the piston rod between the shoulder and the second end; wherein an inner circumferential surface of the frame end cap defines a frame end cap defining a through-bore for receiving the piston rod, the frame end cap forming a first end of the piston, an outer end cap defining a through-bore for receiving the piston rod, the outer end cap forming a second end of the piston, and a center support defining a through-bore for receiving the piston rod, the center support disposed between the frame end cap and the outer end cap, wherein an outer surface of the piston rod and an inner circumferential surface of the center support define a radial gap therebetween; wherein the frame end cap is disposed proximal the shoulder of the piston rod, and the outer end cap is disposed adjacent the second end of the piston rod; wherein the center support includes a sleeve, wherein the piston is disposed on the piston rod between the shoulder and the second end; wherein an inner circumferential surface of the frame end cap defines a circumferential recess; wherein a collar is positioned between the shoulder of the piston rod and the frame end cap of the piston, the collar configured to expand into a circumferential indention of the piston rod and a circumferential inset of the piston, characterized in that the circumferential recess of the inner circumferential surface of the frame end cap is configured to receive the sleeve of the center support.