The GMAX II 3900 Standard Series Gas Airless Sprayer is designed for professional contractors who need dependable performance and durability on every job. Delivering 65% more output than the GMAX 3400, this sprayer produces up to 1.25 gallons per minute and supports two guns for increased productivity. Its Endurance Chromex Piston Pump lasts twice as long as competing brands and features the QuikPak Cartridge System for fast repacking, while the QuikChange design makes on-the-job pump swaps simple. SmartControl 3.0 ensures consistent pressure and a uniform spray pattern for a flawless finish, while the hardened steel Precision Advantage Drive provides quiet, long-lasting operation. Maintenance is easy with the Easy Out Pump Filter, which reduces clogs and mess, and the heavy-duty prime valve withstands high-pressure dumping for reliable performance. Built for rugged conditions, the durable chrome-over-steel frame and pneumatic wheels make transport effortless, and the retractable handle doubles as hose storage for added convenience. Powered by a dependable Honda engine and paired with the Contractor PC Spray Gun for all-day comfort, the GMAX II 3900 Standard Series delivers the strength, precision, and reliability you need for high-volume projects.