AFWFilters Valve Flushing Flow Restrictor for 75 GPD RO Systems with 1/4-inch Quick Connect Fittings, White Easily flush ro membrane with a simple turn of the valve improve water quality! prolong membrane life Built in flow restrictor sized to your ro system this is set for 75 gpd size ro No need for additional tubing or fittings Comes with 1/4 inch female threaded fittings and quick connect adapters