Inert Gas System for Variable Volume Tanks

Inert Gas System for Variable Volume Tanks

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Protect your wine from oxidation!
If you store wine in a variable volume tank in an environment that is not perfectly temperature controlled and the temperature drops, the wine in the tank will contract. As the wine contracts it creates a vacuum and pulls air into the tank. Even in a temperature controlled environment sampling will pull in small amounts of air. The traditional airlocks used in variable volume lids allow air to enter. If air does not enter the tank through the airlock (say if you had a solid stopper in place of the airlock), the internal vacuum pulls on the entire lid, which often causes a gasket failure. The solution is to replace your airlock with our MoreWine Inert Gas Bleeder.

What's Included
Our system comes with a tank lid connection, and diaphragm bleeder regulator. Not included is the stainless variable volume tank, high-pressure gas tank, regulator, or tubing to connect to a high-pressure regulator.

How to Use
As you can see in the picture, the traditional white airlock (on Italian Tanks) or the black screw plastic screw fitting (on our Speidel tanks) is replaced with our white tank connection fitting.

The Diaphragm Bleeder Regulator allows for inert gas to be pulled through a one way valve on demand without putting actual pressure on the tank. If the temperature increase and the wine expands the excess pressure also vents out of this Bleeder Regulator.

If you plan to use Variable Volume tanks for long term storage we strongly recommend these systems as a safety guard against oxidation. Tips:

The correct pressure to set the tank regulator to for use with the WE399 is 2-5 psi. The bleeder valve that is part of this kit has an auto blow off at 10 psi, so having the regulator any higher than that will cause the bleeder valve to vent to the atmosphere and thus drain your gas tank.

Note: The inlet is noted with a molded text "CO2" next to the barb fitting.

Item # WE399
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 3 LBS
Community Q&A

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Why did you choose this?
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Own a winery, have multiple variable top tanks, looking for alternative to traditional airlock
Joshua R on Oct 27, 2020
Own a winery, have multiple variable top tanks, looking for alternative to traditional airlock
Joshua R on Oct 27, 2020
Can one diaphragm support multiple tanks through a manifold / splitter?
Zachary Brady on Apr 15, 2018
BEST ANSWER: Yes, the diaphragm bleeder can be used for multiple tanks.
What size hose does the diaphragm take?
Zachary Brady on Apr 15, 2018
BEST ANSWER: The diaphragm has 3/8" barbs. The tubing included in this kit (D1704) is 5/16" ID to ensure a tight fit.
Beverage Tubing (5/16 in. ID) - By the Foot
Beverage Tubing (5/16 in. ID) - By the Foot
Can you use the 6 way gas manifold (Item #D1815) with the diaphragm to support multiple tanks or will the built in check valve prevent off-gassing from the tank side?
Zachary Brady on May 2, 2018
BEST ANSWER: Check valves in D1815 are intended to be a one way direction. Gas goes in, no beer or gas can come back. This would would probably affect the mechanism in WE399.
However you could rig up a series of Co2 Tees without check-valves, giving realtime equal pressure across all vessels.
CO2 Tee - Stainless
CO2 Tee - Stainless

2.5 / 5.0
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How do you know if its working?
I'd been looking at buying this for probably a year and finally took the plunge. As the owner of 7 variable-capacity tanks, this is something that my small winery could benefit from. Got it installed and attached to my gas tank and then...well...how do you know if its working? I really hope it does what it says it is supposed to do, especially given the price tag, but how is a person to know whether its A) working, B) not working, C) leaking and letting in air??
December 11, 2019
1 year ago
Quality of the product WE399 Inert Gas System for Variable Volume Tanks
I received this Item in November 2012 and put it straight to use on my 220L Speidel Variable Volume Tank. Today, January 06, 2014 I went to disconnect the system from the tank and the connector between the unit and the hose connecting to the Inert Gas system just snapped. In other words, the hose did not come out breaking the connector. To me this must be one of the weakest point of the system, and considering the price charged, I believe this must be fixed.
January 6, 2014