All Style Industries 1-1/4 All Style Small STD-Storm Collar Flashing; Fits Pipe Size 1-1/4 in. Diameter (1.66 O.D.) Round Pipe in the Vent Pipe Flashing department at Lowes.com
All Style Industries 3 inch All Style Medium Standard STD-Storm Collar Flashing for 3in. Diameter (3.5 in. O.D.) Round Pipe in the Vent Pipe Flashing department at Lowes.com
B-Vent Storm Collar
Large Pipe Flashing / Storm Collar, 4 inch (4.5 ID)
Acudor Rain Collar, Galvanized Steel, 4 inch
Saf-T Vent® 4" Category III Storm Collar at Menards®