Suttner ST-2600 Pressure Wash Guns with Extension 310 Bar 45 Lpm. The Suttner ST-2600 range of guns are based on the best selling ST2300 guns, but with the added advantage of being fitted with the LTF (Low Trigger Force) trigger system. The LTF system has a 90% less holding force and a 40% less trigger pulling force, than the standard market wash guns.