The Suttner ST601 is an inline, linear gun that was especially designed to be used with extra long lances, such as the high pressure telescopic lances. The housing is made from impact resistant plastic, and also has a safety lock on the trigger which is made from corrosion resistant materials. This ST601 Gun features “Freeze Stop” technology which is used to prevent damage in freezing temperatures. Equipped with valve in valve technology, the operating valve which is driven by the spray gun trigger includes the automatically operating “freeze stop” piston. The piston only opens when the pressure is less than 10 bar, so the gun will not weep while in use/receiving pressure, but will weep when switched off or not under pressure to prevent freezing.