CAMCO CYCLONE PLUMBING VENT - Use the power of the wind to draw holding tank odors out of your RV. Even a gentle breeze works with the dynamically engineered shape of the CycloneÃ¢â€žÂ¢ to create a powerful vortex that pulls odors up and away. Attaches easily to any RV plumbing vent. Patent Pending. Sewer Vent Cover.