Lippert Components 364464 RV Trailer Camper Sanitation 360 Siphon Roof Vent Black Sewer Vent; 360 Siphon (R); OEM Replacement; Designed To Create An Updraft To Expel Odors And Create An Oxygen Rich Environment For Faster Waste Breakdown; Black; With Cap and Bug Screen; Single Prevents Odors And Gasses From Invading RV Living Space Speeds Up Waste Breakdown, Eliminating The Need For Chemicals Sophisticated, Patented Design With No Moving Parts Works In Any Wind Condition. Easy Installation And Universal Fit