Gelco's special dip-painting system gives this cap a beautiful, low-luster high temperature enamel-like finish. The lid is 24-ga., and the 18-ga., 3/4" mesh is 8" high. This cap grips the flue tile with pointed, slotted, hex-head set-screws. With our weld nut technology, stripped threads are a thing of the past. Tighten down as much as you need. The Gelco galvanized single-flue cap carries a seven-year warranty for workmanship and materials, and a three-year warranty against rust-through.