RV Vent FAQs

RV  Vent Cap Comparison Chart


360 Products Inc has just completed an extensive study on the various RV Vent Caps on the market and we have put together a two page comparison chart. To view and print this comparison chart click here.

RV Vent Cap FAQs

  1. Can I install the 360 Siphon myself?
    If you are uncomfortable with working with the roof membrane and water sealants, please see your local RV service center. If you are comfortable with the above then yes!  See our printable 360 Siphon Installation Instruction Sheet for details.
  2. Does the RV-360 work when my RV is stationary?
    Yes, parked or travelling, this roof top vent eliminates all fumes and gases from the holding tanks
  3. Do you have a video that demonstrates how the 360 Products work?
    Yes, here is a video that explains how all of our products work.  Please note that this is a QuickTime Movie that is approximately 5.5MB so will take a minute or two to load. Click here to view our video.
  4. Why do I smell holding tank odors in my RV?
    Tank fumes seep into the RV thru seals and dried out traps due to a higher air pressure inside the tank than in the RV
  5. Does cleaning the tank more regularly or adding more chemicals help?
    Cleaning the tank wont help because it’s purpose is to hold waste (waste is always dirty and stinky). Adding
    more odor masking agents will camouflage the fumes and gasses so it smells 'perfumey', but you are still inhaling methane, ammonia and other gases.
  6. Why do we get odors sometimes when parked and not at others?
    Due to wind direction. Conventional vent caps cannot handle turbulent wind which is caused by obstacles on the roof top. Depending on wind direction, updrafts and down drafts hitting the vent cap will be forced down the stack pushing fumes out of the tank. Odors will be drawn out of the tanks
    if a lower pressure exists in the RV than the tanks, this can be the result of certain RV doors or windows open in the relation of the wind direction. The solution to this is to maximize all wind available to create a lower pressure in the tank in all situations.
  7. Why when we are on the highway, with a cab window open, we can smell odors?
    This due to the open window causing a lower pressure in the RV than in the tank. This is why it is important to have a vent cap in place that will insure a lower tank pressure.
  8. Why does flushing while traveling smell so bad?
    Again, its due to a high pressure in the tank now having no blockage at all to drift into the living space.
  9. If I put water in the bottom of the toilet bowl will that prevent odors when we are on the road?
    Very unlikely. All RV toilets have a small ½” overflow tube that connects the tank to the underside of the rim. Its has a slight design of  a water trap but its usually dry. You can’t stop fumes under pressure.
  10. I don’t know which tank smells worse the gray water tank or the black?
    In some cases the gray can be worse than the black, again the water traps often dry out due to vibration and heat. The soaps and grease that accumulate in a gray tank can get quite rancid.
  11. Why after traveling does the RV smell bad.
    Same old answer; lower air pressure existed in the RV than in the tanks.
  12. Why does the RV smell bad after draining the tank?
    Due to the fume build up, tank gasses will not come out on their own, if they are drawn off during travel and daily use the odor level is much lower.
  13. Does a vent cap have to rotate to work properly for all wind direction?
    Until the 360 Siphon, yes.
  14. How does the 360 Siphon work? Does it compare to the RV360?
    Its aerodynamicly engineered, it has no wind resistance; it channels wind into is vortex where it creates a low pressure at the exhaust port. The lid is a complex series of shapes that has taken 3 years of design and field testing. It works as well as the RV360 with very similar draw rates. The siphon cannot fail, it’s the worlds only non-mechanical air check valve that eliminates stack down drafts and creates a low pressure in every possible wind direction.
  15. How does the RV360 eliminate smells?
    It does two important things to your sewer system. It is always drawing off odors and gasses out of the tanks so fume build not happen (tank fumes are heavier than air and will not come out on their own), as well it places a low pressure in the tank in all wind condition.
  16. Will it work when stationary?
    Yes, it works even in the slightest breeze, stationary or driving.
  17. What if there is no wind?
    If there is no wind there will never be a problem, air pressure differential cannot happen, so odors will not exist.
  18. Will the Stack Cap work on my house?
    In some cases it can work extremely well. It depends on the problem you have, but if on those windy days that sewer odors are present, its almost certain the Siphon Stack Cap will work. Also works well on outhouses.
  19. Will the Stack Cap work on a composting toilet?
    Composting toilets are designed to draw off the moisture by venting out through the vent stack. Down drafts and extra moisture or rain is definitely not wanted. The Siphon stack cap does both as well as keeping out other airborne debris.


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