We used DC12V voltage to test pumping, and although the rate of the pump was not large,the pressure was very strong. If the mouth of the pipe is slightly reduced by hand,the water column out straight and hit the water with considerable force. The characteristic of a squeeze pump is that it has a small rate but good outlet pressure,making it suitable for pumping viscous/non viscous liquids such as ink., Weight: 0.16203976257 Pounds, Manufacturer: Jaywool