Graco Probler P2 Spray GunFeatures of the Graco Probler P2 Gun Compact and Ergonomic Recognized by the industry for its superior performance, the P2 gun light, comfortable design lets you spray and maneuver easily even in difficult spraying positions. At the end of the day, maintenance for this air purge gun is easy. No cleaning small air passages with tiny drill bits. The P2 has check valves that prevent the liquid portion from infiltrating the dry side of the gun.