Suttner ST-2300 Pressure Washer Spray Guns. The Suttner ST-2300 guns are our best sellers. Robust and ergonomic design, coupled with impressive maximum flow rates and pressures, means that this gun is suitable for all but the heaviest of duty tasks. Maximum Pressure - 310 Bar. Maximum Flow - 45 Lpm. Maximum Temperature - 150 °C. Inlet - Rear.