lappir Posted February 26, 2017 Report Share Posted February 26, 2017 I have read about them (sales info) and think they should work providing there is some sort of air movement. Does anyone have opinions? I am wanting to have them installed at my next visit to the Factory. I had asked about them with the build, but it didn't happen and I didn't push it then. I think I want them now. There does have to be a one way vent to allow air in to have outflow. How does that happen? Rod White 2000/2010Volvo VNL 770 with 7' Drom box with opposing doors, JOST slider hitch. 600 HP Cummins Signature 18 Speed three pedal auto shift. 1999 Isuzu VehiCross retired to a sticks and bricks garage. Brought out of storage the summer of 2022 2022 Jeep Wrangler Sport S Two door hard top. 2023 Triumph Tiger 1200 GT Explorer 2013 Space Craft Mfg S420 Custom built Toyhauler The Gold Volvo is still running and for sale. Link to comment Share on other sites More sharing options...
kayakbob Posted February 26, 2017 Report Share Posted February 26, 2017 I know nuttin about the product ! But it should not be a " one way " valve ! When you dump the flow is in , when in normal use the flow is up and out ! Link to comment Share on other sites More sharing options...
Ron Posted February 26, 2017 Report Share Posted February 26, 2017 I considered getting one of these vent covers when we had problems with tank odor getting inside the trailer. I had the same concern that you brought up; the only way that the vent cover could remove odor was if there was a separate air inlet for the tank. Since there is no designed-in air inlet it led me to conclude that the only reason they "work" is because there are, somewhere, unintended air-leaks that allow air to get from the inside of the RV into the waste tank. So basically the vent cover is only providing a low pressure draw of air out of the tank and therefore causing air from inside the RV to "leak" into the tank rather than "leak" out of the tank and into the RV. After much consideration and then several experiments I eliminated the unintended air leaks and the problem was solved without adding any sort of venturi vent cover. And furthermore this solved the problem without relying on air flowing through the venturi. IMO the only real reason to have vents on the tanks is so that air can escape or enter as the fluid level in the tank rises or falls while either using the tank or dumping the tank. Odor inside the tank is a normal condition and it does not need to me removed. ---Ron Ron Engelsman http://www.mytripjournal.com/our_odyssey Full-Timing since mid 2007 23' Komfort TT 2004 Chevy Avalanche 4x4 8.1L Link to comment Share on other sites More sharing options...
Barbaraok Posted February 26, 2017 Report Share Posted February 26, 2017 Yes they work. The help to increase air flow over the top of the vent, which pulls more air up and out, not they don't impede dumping the tanks. Barb & Dave O'Keeffe 2002 Alpine 36 MDDS (Figment II), 2018 Ford C-Max HYBRID Blog: http://www.barbanddave.net SPK# 90761 FMCA #F337834 Link to comment Share on other sites More sharing options...
Yarome Posted February 26, 2017 Report Share Posted February 26, 2017 Yes they work. The help to increase air flow over the top of the vent, which pulls more air up and out, not they don't impede dumping the tanks. X2. Cheap, effective and have no affect on performance or dumping. Link to comment Share on other sites More sharing options...
roadrunner7410 Posted February 26, 2017 Report Share Posted February 26, 2017 X3. Have had them for several years and solved our black tank odor problem. Ours pivots to get the most efficiency from the vent. Link to comment Share on other sites More sharing options...
Jim Gell Posted February 26, 2017 Report Share Posted February 26, 2017 I replaced a normal vent cover with one of these. I did not add a one way valve when I did it. Rod, what makes you think you need to add the one way valve? Maybe I failed to read the directions. It would not be the first time! Jim 2001 Volvo 770, Detroit 60 Series, Gen 2 Autoshift Passenger assist elevator to enter cab - for when we need it, or sell it? '05 Travel Supreme Select 40 RLQSO 5th wheel 2016 smart car We started full timing on December 1st 2014 Travel is fatal to prejudice, bigotry, and narrow-mindedness - Mark Twain Not all that wander are lost - J. R. R. Tolkien Link to comment Share on other sites More sharing options...
lappir Posted February 27, 2017 Author Report Share Posted February 27, 2017 I replaced a normal vent cover with one of these. I did not add a one way valve when I did it. Rod, what makes you think you need to add the one way valve? Maybe I failed to read the directions. It would not be the first time! Jim I wasn't saying it was in the instructions. I was just wondering how it would draw air out of the tank without a way for more air to come in. I'm sure it doesn't create a huge vacuum. I was wondering out loud (in writing) if a one way valve to allow air in should be installed and where. Rod White 2000/2010Volvo VNL 770 with 7' Drom box with opposing doors, JOST slider hitch. 600 HP Cummins Signature 18 Speed three pedal auto shift. 1999 Isuzu VehiCross retired to a sticks and bricks garage. Brought out of storage the summer of 2022 2022 Jeep Wrangler Sport S Two door hard top. 2023 Triumph Tiger 1200 GT Explorer 2013 Space Craft Mfg S420 Custom built Toyhauler The Gold Volvo is still running and for sale. Link to comment Share on other sites More sharing options...
Barbaraok Posted February 27, 2017 Report Share Posted February 27, 2017 Rod, you are not creating a vacumn, if that is your worry. All water solutions will degas over time, which is what you smell from black tank. Those bacteria you transfer from your nteestines keep on 'working' when in the black tank and gopive off by-products includingmethane, hydrogen sulfide, carbon dioxide, water vapor, oxygen, and other gasses. By creating a Venturi effect those gasses will move up and out and will be replace by other gasses from the fluid in the tank. Barb & Dave O'Keeffe 2002 Alpine 36 MDDS (Figment II), 2018 Ford C-Max HYBRID Blog: http://www.barbanddave.net SPK# 90761 FMCA #F337834 Link to comment Share on other sites More sharing options...
Dutch_12078 Posted February 27, 2017 Report Share Posted February 27, 2017 I installed "360 Siphon" vents on both our previous and current coach with good results. It has no moving parts and a low profile that minimizes tree branch damage potential, as well as a built-in bug screen. Dutch 2001 GBM Landau 34' Class A F-53 Chassis, Triton V10, TST TPMS 2011 Toyota RAV4 4WD/Remco pump ReadyBrute Elite tow bar/brake system Link to comment Share on other sites More sharing options...
billr Posted February 27, 2017 Report Share Posted February 27, 2017 Also went to the 360 vent and it seems to provide a better lift on fumes then the stocker. The wind or breeze and on the road is suppose to cause a bit more draw. Bill and Joan and 3 Collie pups 2001 Volvo VNL 770 "The Doghouse" Singled short, "ET" hItch VED12 465HP Gen 1 Autoshift 3.58 ratio 2005 Mobile Suite 38RL3 2011 Smart Passion loaded piggybacK Weigh-It Portable RV Scales http://www.weighitrv.com/ Link to comment Share on other sites More sharing options...
JCTex Posted February 28, 2017 Report Share Posted February 28, 2017 I put 3-360 vents on my Country Coach. Work very well and do. To have any working parts. The REAL reason I did so,was to lower the vent stacks in order to install my solar panels across them. I had to pay attention to heights of my feet and brackets; but it gave me a LOT more usable real estate. (Thanks to Jack Meyer for the tip.) Pebbledropper 2008 Country Coach Allure 470 38' 425 Cummins, 4 slides, tag 2014 4-dr Jeep Rubicon Link to comment Share on other sites More sharing options...
scouserl41 Posted February 28, 2017 Report Share Posted February 28, 2017 I wasn't saying it was in the instructions. I was just wondering how it would draw air out of the tank without a way for more air to come in. I'm sure it doesn't create a huge vacuum. I was wondering out loud (in writing) if a one way valve to allow air in should be installed and where. Rod If you install a one way (Check) valve you will create more problems. The tank breathes "Out:" as the tank fills and as temperature rises. It breathes "In" when the tank is dumped or the temperature drops. Preventing either of these functions will either pressurize the tank or create a vacuum preventing dumping of the contents. We have the rotating kind of cap (Came with the rig) and the only downside is that on windy days it clunks as it spins. We are long used to it so it doesn't keep us awake at night now. BnB 2009 Monaco Cayman DP 38' bnbrv.blogspot.com/ Link to comment Share on other sites More sharing options...
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