The sprayers in the Green Gorilla ProLine feature a patented Power Pack that easily attaches to the tank with a simple push and click. Rotate the knob to remove the PowerPack while the tank is still under pressure. Swap it to another tank, allowing for increased productivity or attach a freshly charged unit. Every unit is fully tested and precisely tuned to control tank pressure within 2 psi of the optimum pressure (using trademarked Smart Pressure Technology, or SPT). The company notes that this can save technicians up to 25 percent in spray time.