Keep the inside of your RV smelling fresh with thee 360 Siphon® RV holding tank vent cap from Lippert™. This uniquely designed vent cap helps eliminate unwanted odors from invading your RV's living space. The patented 360 Siphon can only create an updraft, expelling odors and fostering an oxygen-rich environment to speed up waste breakdown.. ELIMINATES ODOR - Exhausts odors out the roof vent before they have a chance to invade your RV COMPATIBILITY - Engineered for a universal fit, the 360 Siphon is with all RV vent caps DURABILITY - Built with polycarbonate, the sophisticated, patented design of this vent has no moving parts KEEPS PESTS OUT - A built-in screen helps ensure bugs stay out of your RV, for a worry-free camping experience EFFICIENT DESIGN — Creates an updraft to exhaust odors through the roof vent, giving campers a healthier, breathable environment, in any wind condition NEW IN PACKAGE