Water Treatment ComponentsFlow RestrictorContact Us to PurchaseFeatures Install in the drain water outlet of RO housing to control water discharge. Specification Model Type Spec Remark AC-0164 flow restrictor set, insert style 1/4"OD x 1/8"NPT, 300~400CC Made in Taiwan AC-0170 flow restrictor set, insert style 1/4"OD x 1/8"NPT, 500~550CC Made in Taiwan top Application Suitable for use in RO drinking systems.