Broan 634 6-5/8 x 14-1/4 x 18-3/4 Inch Steel Black Roof Cap | Cooper Electric
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Master Flow 4 in. Goose Neck Vent Roof Cap in Black GNV4BL - The Home Depot
Rain Cap - Galvanized - 4 Inch
4 inch Roof Jack | RBV-4-C4-TP | 4 inch Diameter 4 inch collar