This mill finish galvanized metal plumbing vent cap with base fits over 1-1/2 inch sewer vent pipes. It will accommodate a maximum 6/12 pitch roof and the flange has pre-drilled mounting holes. It is a 2-piece construction and the removable cap securely fastens to the base with a hex nut. Use it to replace those plastic plumbing vents that crack and break. Screws and sealant are not included. (will need to purchase them separately). For use on campers, RVs and older mobile homes. Dimensions: (Base) 5.5 inch in diameter and (Stands) 3.25 inch tall. 1 per package.