WeatherJacs end caps are one pieced, hinged caps complete with stamped sizing labels and an extended 5/8″ to 2″ collar. All WeatherJacs end caps are dimensionally formed in conformance to ASTM C-585 and C450 tolerances. WeatherJacs  come with a factory applied; heat cured, clear polyester or acrylic or coating on the interior for a high performance moisture barrier. The same coating is also applied to the exterior to help resist oxidation and corrosion.