QUALITY: This storm collar is designed to cover metal flashings to divert water from running down the sides of the pipe. It is constructed using heavy 26 gauge galvanized steel.: This storm collar is designed to cover metal flashings to divert water from running down the sides of the pipe. It is constructed using heavy 26 gauge galvanized steel. EASY INSTALLATION: This metal storm collar contains an adjustable tab. Simply bend tab over for a quick and secure fit. MULTIPLE SIZES: This item is available in sizes ranging from 3 Inches to 18 Inches in inner diameter SIZE GUIDE: The size of the collar refers to the inner diameter of the collar once the tab is folded and secured. Please measure accordingly. A storm collar is intended for use with metal pipe flashings to divert water from running down the pipe. This metal storm collar is equipped with an adjustable tab for easy installation, and is constructed of heavy 26 gauge galvanized steel. This product is designed for single wall vent pipes. Sizes range from 3 inch to 18 inch inner diameter.