Barrow G1/4" Female / Female Pass-Through Fittings allow you to make a port that you can screw G1/4" fittings into anywhere you like.Perfect for cases with large external radiators that need coolant lines to run through the case side panel.Great for use as coolant fillport.Simply drill out a hole for the G3/8" male fitting to go through and then tighten on the textured ring.Specifications:Overall Diameter : 24.8mmHole Size (for mounting) : 20mm