Simplex offers five series of electric pumps; G1, G3, G4, G5 and G6 G1 - An intermittent .5 hp power pump that is best suited to power small to medium size tools or cylinders. It's very lightweight and portable. G3 - A 1.13 hp continuous duty power pump that is best suited to power small to medium tools and cylinders. Ideal for systems that require high performance, large oil capacities with lightweight portability. G4 - Continuous duty 1.5 hp electric pumps are best suited for medium size tools and cylinders. G5 - Continuous duty 1.5 hp electric pumps are perfect for medium size tools and cylinders. It's the perfect choice for production and lifting applications due to its reservoir sizes and valve options. G6 - Continuous duty 3 hp electric pumps are ideal for medium to large size tools and cylinders. The high flow rate runs multiple cylinders for heavy lifting, high tonnage and large positioning jobs and applications effectively.