The Lippert 360 Siphon vent cap uses an aerodynamic, omnidirectional design to pull waste fumes up and out of your holding tank vent stack continuously -- even in light wind, even when your RV is parked. Replace that old flat cap and stop odors before they ever reach your living space.
Most stock RV vent caps do little more than keep rain out. The Lippert 360 Siphon is purpose-built to actively draw air upward through your sanitation stack. Its 360-degree aerodynamic profile catches wind from any direction and converts it into a consistent updraft, pulling sewer gases away from your RV instead of letting them stagnate -- or worse, get pushed back down the stack by gusts.
The result is a noticeably fresher interior environment, faster aerobic waste breakdown in the holding tank, and far less dependence on chemical treatments to keep odors manageable. Whether you are parked at a full-hookup campground or boondocking for a week, the siphon effect keeps working as long as there is any air movement at all.
Omnidirectional vane design activates in wind from any direction, creating a continuous updraft that expels fumes rather than trapping them.
Unique cap geometry blocks high-pressure wind gusts from being forced back down the vent stack -- eliminating a primary cause of indoor odor events.
Integrated mesh screen keeps insects, wasps, and debris out of the vent pipe without restricting airflow or requiring separate screens.
Impact-resistant polycarbonate withstands UV exposure, temperature swings, and road vibration without cracking or fading over time.
The 360 Siphon collar accepts both 1-1/2" and 2" diameter pipe stacks -- the two sizes found on virtually all production RVs and fifth-wheels. No reducers or adapters are needed for either size. The 3-1/2" collar diameter and standard 2-7/16" x 3-7/16" mounting hole pattern are designed to match the footprint of most OEM vent caps, making this a direct swap in most installations.
Installation is straightforward and typically takes under 30 minutes:
Holding tank odors in RVs are primarily caused by anaerobic bacteria producing hydrogen sulfide and methane gases. When those gases have nowhere to go -- or when wind pushes them back down the stack -- they find their way into the cabin through toilet seals, drain P-traps, and any loose plumbing connections. Improving the updraft through the vent stack shifts the tank environment toward aerobic decomposition, which is both faster and far less odorous. The 360 Siphon enhances this process passively, with no power, no chemicals, and no ongoing maintenance.
Faster Waste BreakdownDesigned to enhance the natural breakdown of waste, the 360 Siphon helps speed up the decomposition process inside your holding tank. By encouraging a better airflow, it reduces the need for harsh chemicals, offering a more eco-friendly and efficient solution for managing waste.
Simple InstallationInstalling the 360 Siphon is straightforward and hassle-free, with no moving parts involved. It starts working right away with just a light breeze, ensuring your RV stays odor-free without a complicated setup. The cap fits 1-1/2" pipes, and an adapter is included for larger or taller vent pipes, making it a versatile option for different RV systems.
Built for DurabilityConstructed from durable polycarbonate, the 360 Siphon is designed to withstand tough conditions. Its strong build ensures long-lasting performance and reliability, even in challenging weather, so you can trust it to keep your RV fresh on all your travels.