Shop Equipment Landa Pump is now installed on the eight models of its top-of-the-line, belt-drive, cold water pressure washers. The cleaning power for the PG reaches up to 4.7 GPM (gallons per minute) in flow rate and 4000 PSI (pounds per square inch) in pressure. The Landa LT Series Pump has been engineered to deliver the same output as comparable pumps but at 10% fewer RPM, thus extending the life of the pump.