Shurflo 4009 Series Pump 12V - 11.3 LPMInternal by pass will prevent rapid cycling 4 chamber diaphragm pump An accumulator is NOT required with this pump The Shurflo Fresh Water Pump 4009 is constructed for high flow demand, low noise and no rapid cycling. This pump is super quiet, thermally protected, can run dry without damage and can be mounted in any position Dimensions: 208 x 105 x 125mm C Tick approved 12VDC permanent magnet intermittent duty 11. 3 LpM Pressure switch 30 45 psi shut