Duotight Flow Stopper Automatic Keg Filler

    Description

    Use the Duotight Flow Stopper while filling kegs, during keg to keg transfers, or fermenter to keg transfers to automatically cut off the flow when the keg is full. Simply attach this device to the output gas post of your keg, then when the keg is full it will prevent further liquid exiting the gas post.
    The Flow Stopper pairs perfectly with the BlowTie Spunding Valve, which will enable you to apply head pressure to the keg. This allows you to 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.
    Includes:
    • 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

    Duotight Flow Stopper Automatic Keg Filler

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      SKU: DUO250

      $16.49

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        Description

        Use the Duotight Flow Stopper while filling kegs, during keg to keg transfers, or fermenter to keg transfers to automatically cut off the flow when the keg is full. Simply attach this device to the output gas post of your keg, then when the keg is full it will prevent further liquid exiting the gas post.
        The Flow Stopper pairs perfectly with the BlowTie Spunding Valve, which will enable you to apply head pressure to the keg. This allows you to 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.
        Includes:
        • 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

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        Shipping Weight: 0.1 lb

        Recently viewed products

        This automatic filler enables hands-free, closed transfers for kegs and growlers. Customers said it "works like a champ" for preventing spills and oxygen pickup. Most praise the walk-away convenience and easy sanitization. One customer noted occasional ball sticking, resolved with sanitizer spray.

        Tool (positive)Transfers (positive)Filling (positive)Overflow (positive)Valve (positive)
        • 5 stars: 14 (93%)
        • 4 stars: 1 (7%)
        • 3 stars: 0 (0%)
        • 2 stars: 0 (0%)
        • 1 star: 0 (0%)
        D
        David
        Nice Addition

        I added this to my Spunding Valve assembly as I primarily use it for keg to keg or fermenter to keg transfers. Very nice assembly.

        S
        Steven J.
        Duotight Flow Stopper Automatic Keg Filler

        2 kegs and it seems to work. I still keep a close eye on the process but haven't had any problems.

        J
        James
        Walk away

        Great product added spunding when in use. scale and babysitting not needed. Great.

        T
        Ted
        Go With the Flow (Stopper)

        Haven’t stepped up totally to kegging but now packaging in 2.5 litter growlers for my 10 liter batches Flow stopper makes it easy peasy.

        K
        Kurt
        Avoid oxygen pickup when transferring to a keg

        Another tool to reduce O2 pick up especially for hoppy beers. I can CO2 purge my keg and preform a closed transfer using this device to auto shut off when the keg is full. Especially helpful filling multiple kegs. Allows you to clean up and not have to worry about overfilling while multitasking.

        c
        curtis
        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!!!!!!!

        N
        Nicholas
        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.

        J
        John
        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.

        G
        Gary
        stop beer spill

        This device saves the day when filling kegs Must buy and try you won't be sorry

        M
        Mike R.

        keg filling never done easier

        R
        Rick

        Work good for for filling kegs

        M
        Matt
        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!

        E
        Eric
        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!

        A
        Aaron
        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.

        G
        Gerald
        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!

        A
        Anonymous

        Does this need to be used with a ball lock gas fitting that comes off the keg at a 90 degree angle like the stainless torpedo fittings do? I have the plastic ones that come off the keg at 45 and i worry that angle might keep it from functioning.

        MoreWine

        Ive had no issues with it

        MoreWine

        I’ve exclusively used it with the plastics to great success. Bonus info: letting it soak immediately disassembled in a pyrex measuring cup is a great way to get rid of yeast guck.

        MoreWine

        I think that it does need to 90 degree angle to work best. Less likely that the ball will not lodge in the top properly.

        MoreWine

        it works ok with the 45 degree ones. As long as it points "sort of" up it will work. I've used it with the old style fittings successfully though i have since upgraded to the latest kegland 90 deg ones.

        MoreWine

        That’s a good question. You can still use it. The coupled pieces have short segments of tubing between them which allows for some bend. You can bend and manipulate it as needed. It doesn’t need to be perfectly upright.

        MoreWine

        I just bought the duotight bev fitting and one of the solid straight fittings. It's a few more bucks for peace of mind. I've found you still have to keep an eye on things as the ball doesn't always float well to seal things off.

        A
        Anonymous

        Do you sell just the ball?

        A
        Anonymous

        Are there any detailed assembly instructions?

        MoreWine

        If you look at the pieces and the picture you've already figured it out. It's that easy.

        MoreWine

        No. Just assemble like picture after you sanitize it

        MoreWine

        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.

        MoreWine

        I don’t remember any but wasn’t hard to figure out by looking at the picture.

        MoreWine

        Follow the picture and you'll be fine

        A
        Anonymous

        Can this be used if you have a checked gas disconnect?

        MoreWine

        Not sure exactly what you mean by checked gas disconnect. Could you please specify?

        MoreWine

        If the disconnect itself has a check valve then no it won’t work. But if you disconnect is transparent then you already have a way to see if the keg is full 😉

        MoreWine

        No. The checked valve flows only into the keg. You will need to use an unchecked QD for this device.

        MoreWine

        I don't believe so because this takes the place of the gas-in arrangement by screwing onto the quick disconnect. A check valve would typically prevent the filling of the cylinder of this device that stops the flow. Essentially this device becomes the "check valve"

        MoreWine

        No - checked gas disconnect is essentially a one way valve for gas in so it won't allow flow from keg to the flow stopper

        MoreWine

        No as the liquid coming to your checked gas valve will be stopped from passing through the disconnect.

        A
        Anonymous

        Will foam trigger flow stoppage thus preventing a spunding valve from getting soiled? How vertical does this need to be to function?

        MoreWine

        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.

        © 2026 MoreWine

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