This vent is sized to fit on the end of a standard pipe. The inner diameter of this vent cap matches the outside diameter of standard PVC pipes. Other various are possible upon request, like vents to fit inside standard fittings (vents matching the same OD as the pipe). This is an all plastic vent pipe termination mesh screen to keep varmints, birds, and large insects out of your plumbing or other vent pipes. No metal so no worry about corrosion. Made from PLA material. Please reach out with any questions or clarifications. This Vent Termination Mesh Screen is an essential item for any PVC vent pipe. Made entirely of durable plastic, this mesh screen is designed to withstand any climate or weather conditions, ensuring the longevity of your ventilation system. Its unique design allows for maximum airflow while keeping out unwanted debris and pests. Ideal for use in industrial or residential plumbing and fixtures, building materials and supplies, or any business and industrial setting, this Vent Termination Mesh Screen is the perfect addition to any ventilation system. Its simple installation process ensures that it can be easily added to any existing pipe system without the need for professional help.