Johnson Pump Accumulator Tank - 1/2" Hose Barb [09-46839-01]Accumulator Tank The use of an accumulator tank is recommended to ensure effective and reliable system function. With an accumulator tank incorporated in the system, the intervals between cut in and cut out will be longer when only small amounts of water are drawn off. Less wear and tear on the pump with fewer starts and stops. Pre pressurized at 0. 8 bar 12 psi. Volume: 2L 0. 5gal Port connections: 1 2" hose Height: 315mm 12. 4" Diameter; 160mm 6. 3"