Medium-size crank-connecting rod mechanism pump for use on high pressure cleaning systems. This pump, for use up to 500 bar, is derived from the existing RG series pumps, with a new-design head with the intake valves placed above the plungers to generate higher-than-normal pressure. The pump is of conventional design, with crankshaft in high-strength steel supported by two high-quality, oversized tapered roller bearings. The connecting rods are in a special low-friction alloy. The pump body and side covers are in anodised die-cast high-strength aluminium alloy. The pump features one-piece ceramic plungers and double gasket sealing system. The valves of rugged construction to withstand the high operating pressures.