The new Nelson R55 VT uses a patented variable torque speed governing system that allows the plate to maintain a constant rotation speed across a broad range of nozzle sizes and pressures. This new design also incorporates snap-fit nozzles, eliminating the need for a retaining pin. The inverted R55i VT, with a specifically engineered green plate, is easier to install and it’s effective in helping manage debris that collects at the end of the system.