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A hydraulic backflow preventer is a component which is always ignored, but that is actually a vital importance inside a plant and is required from the companies which supply drinking water. Thanks to the backflow Preventers, it’s possible to avoid that the public grid is polluted, so it’s about a system which is able to protect the backflow towards the public grid. Inside a house, the hydraulic backflow preventer helps to protect the aqueduct system from eventual contaminations especially when we have an autonomous plant in our home. This component is very used t from the retailers, especially from those who have a dry cleaner or a photoshop, the installation of a backflow preventer is necessary.