Features: UV-resistant, fit for most pipes. Suitable for 1 to 2 3/8inch pipes. High quality material, durable in use. Vent mounts on top of your RV's ventilation pipe. Cap easily snaps onto the vent. This roof vent expels sewer-gas to prevent unpleasant odors from entering your RV's cabin through your plumbing. Specifications: Material: Plastics Package Includes: 1 Set Plumbing Vent Cap note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.