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450 FR (Flow Restrictor 450) Suitable For All Brand RO Water Purifier, 450 FR Suitable For 50 GPD, 75 GPD, 80 GPD, 100 GPD RO membrane, with in-built 1/4" (6mm) quick fit connector in FR, In Package :- 1 pcs, RO Reverse Osmosis (RO) FR 450 ML Flow Restrictor Reverse Osmosis Quick Connect InLine 450 Flow Restrictor. This flow restrictor is to be installed in the drain tubing. The restrictor has 1/4 inch Quick Connect fittings. A flow restrictor will create back pressure on the membrane and allow the membrane to produce purified water to be delivered to the pond, MG WATER SOLUTIONrium or water tank. Flow restrictors are sized to match the flow with the size of the membrane. In selecting a flow restrictor, be certain you do not "under size" the restrictor as you will prematurely foul the membrane. If you "over size" the restrictor, you will be wasting water but not causing damage to the membrane.