The Green Gorilla powered spray system connects to a premium spray tank, and eliminates manual pumping by pressurizing the air within the system. The Power Pack’s rechargeable Lithium Ion power lasts for hours. The system also serves as an automatic pressure relief for added safety. Power Packs can be snapped between tanks with no cross-contamination. Available in 1.5-gal. and 2.5-gal. tanks.