Catering for all the needs of the professional, taking both 310ml and 400ml cartridges. The heavy duty design allows for use with medium to high viscosity material. Engineered to have a life of many thousands of cartridges. The patented Pressure Relief Device can be turned on or off. On; it helps minimise any overflow, off; it allows a more continuous flow for a long even bead. The large aluminium cast trigger with a 12:1 ratio aids control. All parts made to the highest standards.