The standard RS 909 Hopper and the optional 12H pump cell are the newest upgrades to this company’s boom pump line. The new features allow for less maintenance and accommodate higher concrete pressures. The hoppers are upgraded to the more robust, yet lightweight, RS 909. The multi-piece grate has bolted connections that allow replacement of just one bar in the hopper grate if it is damaged. The 12H pump cell accommodates a higher pressure of 1233 psi on the rod side and 1885 psi on the piston side, allowing further pumping distances. Putzmeister America.