The R11 is a high pressure single stage centrifugal pump with advanced pitot tube technology. Advance design allows the R11 to function with only two basic working parts for enhanced reliability and dependable performance. This Roto-Jet pump is a popular, dependable unit. Roto-JetĀ® pumps have a unique pitot tube technology that provide a more durable solution in demanding and difficult, high pressure applications. It is totally, hydraulically stable and can operate with a minimal continuous bypass flow at shutoff indefinitely and at any flow point throughout the total head curve range with no wearing or damaging effect to the pump.