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The 360 Siphon RV holding tank vent cap eliminates odors from the source - the holding tanks - and exhausts them out the roof vent before they have a chance to invade the RV living space. By design, the patented 360 Siphon can only create an updraft, expelling odors and fostering an oxygen-rich environment to speed up waste breakdown. Even environmentally-friendly tank additives can take up to 48 hours after use to fully oxygenate a standard holding tank. The 360 Siphon acts immediately after installation in any wind condition (with or without a breeze) to provide the ideal environment for proper decomposition, so caustic chemicals and perfumed cover-ups are no longer needed. The 360 Siphon can be refitted to any RV in less than 20 minutes with a screwdriver and a putty knife (to scrape off any old sealants). The 360 Siphon replaces factory-installed vent caps and is a permanent, one-time, maintenance-free application. 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 Made in America of strong polycarbonate Available in black or white Easy installation and universal fit Built-in bug screen No maintenance