The Gelco Galvanized Multi Flue Top Cap offers complete flue and crown protection whether you have multiple, odd-sized or unlined flues. A great bonus with these multi-flue chimney tops is their non-strip weld nut technology. You'll also enjoy our convenient wing nut attaching option. Both cap screws and wing nuts are included. Each top features a 24-ga. lid and 8" high, 18-ga., 3/4" mesh screen. Masonry fasteners are included. Gelco's galvanized multi-flue chimney top is quality construction with full-resistance welds, a one-piece screen and a special cross break in the lid for added strength. It comes with a seven-year workmanship and materials warranty and a three-year warranty against rust-through.