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 Cyclone to create a powerful vortex that pulls odors up and away. Attaches easily to any RV plumbing vent. Patent Pending. Sewer Vent Cover. Use the power of the wind to draw holding tank odors out of the RV Rotates 360 degrees to follow the wind Attaches easily to any RV plumbing vent White in color No drilling into your rooftop MODEL NO - 40595