Malida 1/4 "x1/4 " Tube Push Union Elbow Quick Connect for RO Water Filter Fitting Pack of 5 Light Weight,Easy Install and unload Applications: Apply to Reverse Osmosis Water System and Housing In Line Filters ETC Tube O.D.(Left x Right): 1/4" x 1/4" Middle Thread Size : 1/4 " / 12.50.3mm Filtered water fittings