Reading Technologies Inc EH4000-3R Eliminator Ii 1/2" – 3/8" Reg. Outlet, Regulator/Gauge Assembly- This product Features a 3/8” Outlet per Paint MFR’s specs, “Inverse Flow” Filtration with 31/2” Filter Depth, Activated Carbon 1st Stage for Oil Removal, Desiccant 2nd Stage for Dew Point Suppression, and Non-corrosive Aluminum Bowls & Zemag Heads.