As per customer application with different criteria like Capacity 0.5 hp to 150 hp Electrical Motor type and Power Pump (Gear Pump, Vane Pump, Piston Pump) Maximum and operating pressure Accessories — Optional (Oil Level switch, Thermostat, Coolers, Hand Pump, Drain port, Heater, Filter etc.) Manifold / Valve Block Reservoir capacity Weight & Size of Power pack