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This is Inline Flow Restrictor for RO System with Quick-Connect Fittings. This most common type of flow restrictor connects easily anywhere on the RO drain line. If your system has a flow restrictor that looks like this one, then simply put the new one in place of the old. Some RO's use other types of flow restrictors which are all less common. These include drain fittings with built-in restrictors and capillary flow restrictors that insert into one end of the drain tube. All these alternative types of flow restrictors would not be visible without removing the drain tube or fitting from the membrane housing. However if your drain flow restrictor does not resemble the one shown on this page, then you must have another type of restrictor. In this case it is important to find and remove the original flow restrictor because if this is not done then it will serve no purpose to add the new one.