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Flow Restrictor Flow restrictor to be used on waste water line of RO systems. Choose size needed in the above. 1/4" Tubing Capillary flow restrictor is inserted into the drain line tubing, which is then inserted into the membrane housing. Color Selection The color and flow rate correlations are as follows: Black - 25 GPD Membrane Yellow - 36 GPD Membrane Green - 50 GPD Membrane Blue - 75 GPD Membrane White - 100 GPD Membrane

    Capillary Flow Restrictor

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