Duotight Flow Stopper Automatic Keg Filler

Duotight Flow Stopper Automatic Keg Filler

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The Duotight Flow Stopper is a handy devicie to use while filling kegs or when transferring between kegs during filtering or after fining. Simply attach the Flow Stopper to the gas post of your keg, then when the keg is full it will automatically cut off flow and prevent excess beer from exiting your gas post and spilling onto the floor.
For even better results, we recommend using the Flow Stopper with the BlowTie Spunding Valve. The BlowTie will enable you to apply head pressure to the keg, meaning you can control the flow speed and reduce the foam generated in the filling process. You will need a short length of 8 mm OD EVABarrier tubing to connect the BlowTie to the outlet of the Flow Stopper.
  • 2 x Duotight 8 mm x 5/8" FPT (DUO104)
  • 1 x Duotight 8 mm elbow (DUO107)
  • 1 x Duotight 8 mm x 1/4 in. flare (DUO106)
  • 1 x Ball float
  • 1 x Stainless spring
  • 2 x 8 mm OD EVABarrier joiners
  • 1 x Acrylic sight glass
Ball lock fitting and BlowTie spunding valve not included.
Kegland Part number: KL09393
Item # DUO250
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.12 LBS
Community Q&A

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Browse 6 questions Browse 6 questions and 57 answers
Why did you choose this?
MoreFlavor Store
for purging kegs and easy filling of kegs from conical without scale
John H on Oct 12, 2021
Stop mucking up my spunding valve when I transfer to keg
Mark P on Sep 14, 2021
for purging kegs and easy filling of kegs from conical without scale
John H on Oct 12, 2021
Less anxiety when doing transfers
Ted on Oct 8, 2021
Stop mucking up my spunding valve when I transfer to keg
Mark P on Sep 14, 2021
stepping up my kegging game. Adding to spending valve for pressurized filling/transfer.
Ju S on Sep 13, 2021
so i can see when its getting close to when my keg is full
curtis g on Sep 1, 2021
Keep beer from getting to the pressure gauge while transferring under pressure from fermenter
Kurt H on Aug 28, 2021
Filling mini kegs
Justin B on Jul 15, 2021
keg to keg transfers
Joseph G on Jun 17, 2021
For close transferring into my kegs
Randall K on Jun 2, 2021
Time saver
Tracey H on May 25, 2021
Keg filling
Kenny Lyons on Mar 30, 2021
need for ease to stop over spill of kegs
Gary Sanger on Mar 25, 2021
I recently started transferring pressurized beer to kegs. Thought I'd give it a try.
mark a on Feb 16, 2021
So I don’t have to watch kegs so closely as they fill
Will S on Jan 13, 2021
Easy transfer from Primary to Keg
Miguel Corrales A on Dec 9, 2020
Saw this on your site. I want a contained method to transfer from fermenter to keg.
Richard W on Nov 11, 2020
dont want to over fill
wes m on Oct 1, 2020
for easy closed transfer kegging
Michael C on Sep 24, 2020
I overfilled my last keg doing closed transfer. Hope this will keep that from happening again.
William S on Sep 4, 2020
closed transfer
steve geer on Aug 24, 2020
make tranferring from fermenter to keg more seamless
Kim Z on Aug 12, 2020
To fill up kegs
Wenceslao Q on Jul 21, 2020
Gift for friend. Great accessory for filling kegs (when used with pressure regulator
Mike F on Jul 13, 2020
To assure kegs properly filled.
Allen H on Jun 27, 2020
Nervous about pressure transfers
Ken M on Jun 18, 2020
To not overfill keg
Joseph M on Jun 10, 2020
Want to try this
Thomas J P on Jun 8, 2020
I'm filling keg-to-keg. This will be useful for that. ;-)
Matthew S on Jun 6, 2020
To transfer beer from larger kegs to smaller kegs while keeping the beer in an oxygen-free environment.
Tim B on May 19, 2020
Want to get into bigger batches and fill a keg under pressure with spending valve without getting overflow beer in valve
Michael A on May 16, 2020
To make pressure transfers easier
Justin B C on Apr 4, 2020
Reduce spillage and know when keg was full
Stephan E on Mar 21, 2020
Pressurized closed transfers.
Kyle Heon on Mar 13, 2020
Makes filling kegs easy, no more overflows!
Keith M on Mar 5, 2020
Closed transfers
KJ H on Mar 4, 2020
Setup auto filling with my RO filter
Trevor Mack on Nov 20, 2019
This is genius
Mrob on Nov 12, 2019
Looks useful
Ed A on Nov 4, 2019
Keg filling while I do other things
Gerald H on Oct 16, 2019
I haven't tried this yet But I do expect that this product wil equal be like the other duotight products and with it too; I will get consistent results filling my kegs everytime
David C on Oct 12, 2019
Less anxiety when doing transfers
Ted on Oct 8, 2021
stepping up my kegging game. Adding to spending valve for pressurized filling/transfer.
Ju S on Sep 13, 2021
Can this be used if you have a checked gas disconnect?
Antonio Martinez on Apr 22, 2020
BEST ANSWER: No. The checked valve flows only into the keg. You will need to use an unchecked QD for this device.
When transferring uncarbonated beer to a keg, will this stop flow before the gas tube is submerged?
Jacob Bryant Fleener on Jan 15, 2020
BEST ANSWER: No...not at the exact moment it reaches the bottom of the gas tube But shortly after when it rises up into the flow stopper a.k.a. (a check valve) and causes the ball to rise and shutting off the flow to the keg. * you will have about 1 inch of head space left in your keg left.

take care
Will foam trigger flow stoppage, thus preventing a spunding valve from getting soiled? How vertical does this need to be to function?
Colin Kelemen on Feb 6, 2020
BEST ANSWER: Colin - This should actually be placed on the gas in side, before a spunding valve. We do recommend FE690 to throttle filling, but this can be placed after the flow stopper.
BlowTie Diaphragm Spunding Valve
BlowTie Diaphragm Spunding Valve
Are there any detailed assembly instructions?
Ben Wells on Nov 25, 2020
BEST ANSWER: I think mine came assembled, in any case, it’s all push to connect fittings and there are only a few pieces, you’ll have no trouble assembling it just based on the picture. Put the orange stopper above the spring and you’re good to go.
Can you use this with a sanke keg with the proper fittings?
Kenneth Graley on Oct 31, 2019
BEST ANSWER: Maybe, you would need the Sanke adapter (https://www.morebeer.com/products/sanke-flare-adapter-14-male.html) but you might to need to change out some of the tubing/connectors to get the proper angle.

4.9 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
awsome tool
I transfred 15 gallons from one keg to another it worked great i have it hooked up to a blowtie spunding valve and they both worked great!!!!!!!
September 14, 2021
1 month ago
Rated 5 out of 5
Great tool for kegging
This thing is great if you’re like me and make a little over 5 gallons. I pressure transfer into kegs. Now I don’t even need to hang around to babysit the filling.
May 11, 2021
5 months ago
Rated 4 out of 5
Works great with one caveat
This has allowed me to walk away from my closed transfers without worrying about making a mess or gumming up my spunding valve.

I did have one instance of the ball getting stuck and not seating properly - I now give the tube a quick spray of star san first and haven't had an issue.
April 21, 2021
9 months ago
Rated 5 out of 5
stop beer spill
This device saves the day when filling kegs Must buy and try you won't be sorry
April 15, 2021
6 months ago
Rated 5 out of 5
keg filling never done easier
April 2, 2021
6 months ago
Rated 5 out of 5
Work good for for filling kegs
December 30, 2020
9 months ago
Rated 5 out of 5
Works great, allows walk away keg filling
Have used this for a few batches. Its easy to take apart to sanitize. I use a blowtie sounding on the output to regulate fill speed.

works well, I can now set up my pressurized transfers, walk away, and come back to a full keg!

Only wish I had gotten this sooner!
August 12, 2020
1 year ago
Rated 5 out of 5
Simple, Awesome
I've tried many homemade versions (gas connector with tube to water bucket or daisy chain to 2nd vessel..

Was the DOD last month so I thought I would give it a try.

Excellent and cheap solution here for keg filling and transfering.

Pick one up!
November 13, 2019
1 year ago
Rated 5 out of 5
Worked like a charm!
I had been using a gas disconnect combined with weighing the keg as I filled it to monitor fullness. This got me by for a while, but I was excited to see this product. It worked exactly as advertised and helped me fill a keg to the brim without any spillover which happened with the gas disconnect. One word of warning: ensure the tubes a all the way snug in the valves. If they are not it will leak.
Worked like a charm!
Worked like a charm!
November 11, 2019
1 year ago
Rated 5 out of 5
Works like a champ - very little overflow, if at all
This will allow you to walk away when filling kegs. I brew 10 gallon batches regularly, so I have 2 kegs to fill from one large fermenter. I have used this with no fear of returning to a pool of liquid on the floor, anymore!
October 30, 2019
1 year ago