These three series self-priming JET/JS pumps equipped with same Venturi system each. They are suitable to convey clean water and non-aggressive chemical fluids, even with liquid mixed with gas, from well in continuous duty; they are also indicated to increase water pressure in centralized water systems, for small irrigation systems, for watering gardens, for washing systems with water jets, for fountains, etc. It is normally advisable to install a foot valve on the suction branch.