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Its required to put the one-way gas check valve at maximum 30 cm from the gas inlet of the ozone nano bubble generator. The one-way gas check valve avoids water getting into the gas hose and protects the ozone generator. Please make sure the one-way gas valve is installed correctly with the arrow pointing towards the ultrafine bubble generator as the gas must flow into that direction. The ozone gas check valve is made from stainles steel 316L and has a viton seal both of these materials are ozone resistant.