Hands on Review: Kegland DuoTight Fittings & EVABarrier Tubing!

Kegland’s DuoTight Fittings are designed to work with EVABarrier Double Wall Tubing.  They offer quick, reliable connections, easy implementation, a variety of fitting options and feature amazing versatility.  They’re also, generally speaking, very well priced.  DuoTights are push to connect fittings and require no tubing clamps.

In This Review:

  • How to Use DuoTight Fittings – No Tools or Clamps Needed!
  • DuoTight and EVABarrier Sizing
  • A Closer Look at DuoTight Fittings, EVABarrier Tubing and Related Tools
  • DuoTight Compatible Locking Clips
  • More About EVABarrier Double Wall Tubing
  • EVABarrier Tubing Resistance Estimations
  • Beer Line Tidy for EVABarrier Tubing
  • Does EVABarrier Tubing Work with John Guest Fittings?
  • Converting My Kegerator to DuoTights and EVABarrier
  • Tips for skipping ball valves in your DuoTight Setup
  • A Tweak For Super Clean DuoTight Kegerator Installs
  • Build a DuoTight CO2 Gas Manifold
  • Kegland DuoTight Ball Lock QDs
  • Pressure Tests
  • What is the Maximum Pressure for DuoTight Fittings?
  • Nukatap Counter Pressure Bottle Filler
  • DuoTight Inline Secondary Regulators
  • BlowTie Spunding Valves
  • Leaks? Troubleshooting EVABarrier/DuoTight Leaks
  • Conclusions
  • More Interesting and Unique DuoTight Compatible Fittings & Gear

How to Use DuoTight Fittings – No Tools or Clamps Needed!

DuoTights feature a unique double EPDM O-ring design.  Coupling and uncoupling is quick and easy and requires no tools or clamps.

DuoTight Ball Lock QD on Left, Compatible EVABarrier Tubing on RightMaking a pressure capable connection is as easy as pushing the tubing all the way in the fitting and firmly pulling the tubing out.To disengage the connection press the collar toward the fitting body and pull on the tubing.  A couple tools are available to help with this process.  See below for photos and links.

Finding DuoTight Fittings and EVABarrier Tubing, Review Continues Below:

DuoTight and EVABarrier Sizing

DuoTight Fittings and EVABarrier Tubing are generally available in two sizes, 8 mm and 9.5 mm.  Your fittings and tubing need to be the same size to be compatible.  Size converters are available, but I would generally suggest picking one size and standardizing on it.  For most homebrewers, I think that the 8 mm size probably makes the most sense.  It doesn’t really matter for gas and the smaller size will probably be more convenient to homebrewers as it offers increased resistance on the liquid side.  If you have a pro setup or long runs, the 9.5 mm size may make more sense.  Either way, understand that multiple sizes are available for many but not all fittings and accessories.

I have standardized on 8 mm.  Those are pictured and discussed in this review but general concepts should apply to both all sizes.

Note that sometimes DuoTight and EVABarrier tubing are labeled using English measurements 3/8″ for 9.5 mm and 5/16″ for 8 mm and 15/64″ for 6 mm.

A Closer Look at DuoTight Fittings, EVABarrier Tubing and Related Tools

DuoTight x 1/4″ Flare Fitting.  I use these for keg QDs, manifold conversion and regulators.DuoTight x 1/4″ Flare Fitting.  A look at the flare threads.

More DuoTight Reviews on How-To’s!

DuoTights are so amazing – at least in my book 🙂 – that I have several reviews and related top posts. These are mostly linked in this review, but here’s a rundown for quick reference.

DuoTight Check Valve.  These keep things moving one way.  Particularly helpful to help prevent backflow on the gas side.DuoTight Check Valve.  Side view – the arrow shows flow direction.  This fitting is labeled duotight 8.  The 8 is an indication of the 8 mm size.DuoTight to Female Beer Thread.  I use these on my kegerator shanks.DuoTight to 1/4″ ThreadsDuoTight to 1/4″ Threads – Side view – This fitting is labeled duotight 8.  The 8 is an indication of the 8 mm size.A Look into the DuoTight to 1/4″ Thread FittingDuoTight to 1/4″ Threads – the threaded side.  Note this fitting includes an o-ringDuoTight Joiner/Coupler.  Used for joining two sections of EVABarrier Tubing together.DuoTight Tee Fitting.  Lots of uses, but one good one is adding another keg to your kegerator without the use of a manifold.  The modular DuoTight system allows you to easily configure and reconfigure your kegerator.
DuoTight Ball Valve.  I think you can potentially skip these for kegerator installations.  See some thoughts and tips on that below. DuoTight Ball Valve.  If you zoom in you can see that the handle is labeled to indicate which direction is on and which is off.  This is also labeled duotight 8.DuoTight Cutter – William’s Brewing | MoreBeer – this is a multi function device.  Of course it’s a tubing cutter but it’s also designed to help you remove tubing from DuoTight Fittings.  That part of the tool is pictured on the left side of this photo.  I do like this for cutting tubing, I’m not as big of a fan of using it for helping to remove tubing.  That part of the tool is just too flimsy in my opinion.  What works a lot better for helping to remove EVABarrier tubing….MoreBeer’s KOMOS branded Draft Multi Tool has a notch in it (top middle on this photo) that’s designed to help remove EVABarrier tubing.  This is a much heartier tool that works a lot better for removing tubing from DuoTight Fittings.CO2 Gauge.  I recommend picking one of these up.  It’s good for checking for leaks and you can also easily throw together a keg pressure gauge.  The gauge can be a bit difficult to disengage from DuoTights in my experience.  Once you get the hang of it, it’s easy enough.  But it’s definitely more difficult to disengage as compared to EVABarrier Tubing.

Announcing: New Digital Gauge Option!

Kegland has announced a new digital gauge option! 0-90 PSI, auto-shutoff after 15 seconds and a 2 year battery life with typical use.

Digital Mini Pressure Gauge (0-90 psi) – 8 mm Duotight Compatible D1166 – at MoreBeer

Because of this system’s modularity, it’s easy to take pieces from one assembly to make another.  In this example, I pulled the gauge from my BlowTie v1 assembly and make a Ball Lock assembly to check for leaks

DuoTight Compatible Locking Clips

DuoTight Fittings have a collar that’s engaged and disengaged to connect and remove tubing without tools or clamps.  That collar can accept a locking clip to prevent the connection from disengaging.DuoTight Compatible Locking Clips via Valuebrew.  Note the blue clip that’s installed in the collar.  These snap into place and prevent the connection from disengaging, locking the connection in place.Valuebrew DuoTight Compatible Locking Clips install on several DuoTight Fittings

More About EVABarrier Double Wall Tubing

A spool of 8 mm OD EVABarrier TubingA look a the inkjet labeling on this tubing – 50cm(20 inch) KLO06224 EVABarrier 4mm*8mm Double Wall

EVABarrier tubing is BPA and PVC free.  It’s suitable for both home and professional applications.  It features a double wall design to protect against oxidation.  The smooth inner wall is designed to help prevent microbial growth.  It’s available in a variety of sizes and is generally very well priced.

EVABarrier Tubing Resistance Estimations

When you’re balancing your kegerator, it’s important to know what each component of your system provides in the way of resistance.  See: Step by Step: Balancing Your Kegerator Draft System

Credit for EVABarrier resistance goes to William’s Brewing\

Rigid Tubing JoinerRigid Plastic Joiner for Duotight Fittings - 8 mm DUO201

These are small pieces of rigid DuoTight compatible tubing. that help you neatly DuoTight fittings and accessories together. I wouldn’t call these EVABarrier tubing, because they are different. Much more rigid and all a uniform length.

Beer Line Tidy for EVABarrier Tubing

Beer Line Tidy

This simple adhesive holder is perfect for organizing your EVABarrier beer and gas lines. Just remove the backing and stick. 4″ long, these hold 5 beer lines each.

Does EVABarrier Tubing Work with John Guest Fittings?

Yes. EVABarrier Tubing will work with compatible John Guest Fittings.

Lots More Stuff, Review Continues Below:

Converting My Kegerator to DuoTights and EVABarrier

Old setup.  Each shank required a beer nut, tail piece, tubing clamp and piece of tubing.  In my case I had small sections of tubing and then QDs to attach beer lines.DuoTight Female Beer Thread Fittings – replaces beer nut, tail piece and tubing.Installed!  One well thought out fitting to replace three.All four taps converted to DuoTight.  You can see the edges of my Intertap Faucets at the top of this photo – Hands on ReviewIt’s DuoTight to Flare Fittings that are up to bat next.  These will go on my regulator and Ball Lock QDsMy regulator converted to DuoTights.  A piece of EVABarrier Tubing to CO2 gauge is being used to check for leaksI strung together several tees to test each faucet for potential leaks.  The modularity of DuoTights makes checking for leaks easy and it takes the guesswork out of the process.  I can conclusively tell you my setup was leak free.Both bodies of my dual pressure regulator converted to DuoTightA Ball Lock Gas QD Converted to DuoTightTwo kegs plumbed using DuoTight Fittings.  The modularity of DuoTight Fittings makes it easy to set up your kegerator without the use of a gas manifold.  A tee+check valve means you can easily add another keg.

Tips for skipping ball valves in your DuoTight Setup

As you can see from these photos, I have not used ball valves to convert my kegerator to DuoTights and EVABarrier Tubing.  If you decide to do that and want to reconfigure tubing, just disengage all connected QDs and turn off your regulator shut-off (or turn the tank valve off).  If you leave everything open and on, you could needlessly waste a bunch of CO2.

The following upgrade can also help with this issue…

A Tweak For Super Clean DuoTight Kegerator Installs…

I’m going to make the case that a particular CM Becker/CMB product is a huge upgrade for manifold-free installs.  CMB’s QD with built in check valve.  The built in check valve means you can skip the DuoTight check valve.  Both configurations work, but the addition of the CMB QD with inline check valve really cleans up the install.Both options side by side.  QD + DuoTight Flare Fitting + EVABarrier Tubing + DuoTight Inline Check Valve VS  CMB Inline Ball Lock QD + DuoTight Flare FittingBoth options installed.  As stated previously, both work, but the CMB QD really simplifies and cleans up the setup.CMB QD + DuoTight Flare Fittingthree kegs, three optionsComplete setup – DuoTight Fittings and EVBarrier Tubing installed in my kegerator

Another benefit to using these is that incorporating DuoTight Ball Valves into your setup is not as necessary.  Since gas can only flow in to your keg (the check features stops it from flowing out of your keg), you don’t need a ball valve to keep gas from exiting your keg when you remove EVABarrier tubing.

Ball Lock QDs are featured in this post, but Pin Lock Checked QDs are also available.

Or… Build a DuoTight CO2 Gas Manifold

If you’re looking for a more traditional manifold.  That’s an easy proposition.  See: Build a DuoTight CO2 Gas Manifold! – for Kegland EVABarrier Tubing

Announcing: Kegland DuoTight Ball Lock QDs

When DuoTights first came out, the solution for connecting kegs to EVABarrier was using an MFL QD + DuoTight Flare fitting. That works just fine and is still the only option available to pin lock keg users.

Hands on Review: Kegland DuoTight Ball Lock QDs!

Pressure Tests

Checking a keg for CO2 leaksChecking my regulator for leaksChecking shank fittings for leaksChecking a converted DuoTight manifold for leaks

I’ve completed many pressure checks on these fittings and tubing.  Other than connections that haven’t been quite tight enough (my fault), the system has been rock solid.

What is the Maximum Pressure for DuoTight Fittings?

Generally speaking DuoTights can be rated for up to 100 PSI.  That can vary based on the fitting or assembly.  See your favorite retailer or ask Kegland to confirm specifications if you have questions.  Never exceed rated pressures.

More DuoTight Stuff!

The lineup features some additional gear that’s unique and well thought out…

Nukatap Counter Pressure Bottle Filler

Nukatap Counter Pressure Bottle Filler

Designed to allow you to easily counter pressure fill from Nukatap and Intertap Faucets (and more), Features DuoTight connections!

DuoTight Inline Secondary Regulators

Kegland Inline Secondary CO2 Regulator v2 – via MoreBeer – via William’s Brewing – via Amazon

This is the v2 upgrade of one of my favorite homebrewing gadgets.  v1 was amazing.  v2 adds a built in gauge and DuoTight compatibility.  Both are huge improvements and make v2 all the better.  You can use this to set specific pressures and carbonation levels on each one of your kegs and lots more.

Duotight In-Line Regulator D1046

Duotight In-Line Regulator D1046 – Same idea as above with no gauge to reduce costs.

Mounting Boards for Inline Secondary Regulators

Thank you to /u/skaht on reddit for this photo

These allow you to neatly install compatible inline regulators for easy access and a neat setup.

BlowTie Spunding Valves

BlowTie Spunding v1.  As of this review, this is still available to purchase although it’s been replaced by v2.

BlowTie Spunding v2 – via MoreBeer – via William’s Brewing.  Builds on v1 by adding an integrated gauge.  This is a great Spunding Vale Solution!

Announcing: Digital Gauges for Inline Regulators and BlowTie!

Kegland Digital Gauge to fit Spunding Valve and Secondary Pressure Regulator

Kegland has released a digital regulator option that works with their great inline regulator and BlowTie Spunding Valve.

It appears as though though Kegland will offer both complete digital inline regulators and spunding valves and a regulator only option that will retrofit analog units.

Digital Mini Pressure Gauge (0-90 psi) D1165 at MoreBeer

Leaks? Troubleshooting EVABarrier/DuoTight Leaks

I’ve done several pressure tests with DuoTight Fittings and EVABarrier Tubing. Each test has proven the tested components were leak free. Having said that, it’s entirely possible that you’ll have a leak. This happens with any tubing system, that’s why we… check for leaks. Some tips…

  • Check for leaks as you would if you were using standard tubing. DuoTights and EVABarrier are amazing… but not magic. They need to be installed correctly and securely throughout your system. Liquid liquids are easy to spot. Gas leaks are a little more difficult.
  • I highly suggest picking up a DuoTight Pressure Gauge. You can easily add this to your setup and use this technique for checking for gas leaks.
  • If you have a section of EVABarrier tubing that’s marred or damaged, cut off a couple inches to get a fresh end.
  • Make sure you’re pushing the EVABarrier Tubing completely in to your DuoTight Fitting.
  • Make sure you’re pulling your EVABarrier Tubing out firmly to engage the sealing mechanism.
  • DuoTight Compatible Locking ClipsI recommend using these on all DuoTight connections. They snap into place pushing the collar out, securely engaging the fitting. They also help prevent bumps and moves from disengaging the connection.
  • If you have a particular fitting that won’t seal… contact the seller or manufacturer to get a replacement. A leaking DuoTight fitting is not normal and I’m guessing your retailer will take care of you. Out of the dozens of fittings I have I’ve had 1 that was non-functional on receipt.


Combine features, versatility, quality and cost and I think the DuoTight/EVABarrier System is a game changer for kegerator builders and owners.  Kegland has produced some really unique, well thought out and generally really well priced homebrewing and beer gear.  I’ve owned and used these for months and continue to be super happy.  If you’re building a kegerator or are ready to upgrade and modernize your setup, these deserve a very hard look.

DuoTight Fittings and EVABarrier Tubing:

DuoTight Compatible Locking Clips

More Interesting and Unique DuoTight Compatible Fittings & Gear

One of the coolest things about DuoTights is their modularity.  Beyond the core system of EVABarrier Tubing and Fittings, additional DuoTight Compatible Fittings and products are available.

DuoTight x 1/4" Barb Fitting - Pack of 3DuoTight x 1/4″ Barb Fitting

DuoTight Compatible Picnic Faucet

Duotight Push-In Fitting - 9.5mm (3/8 in.) Female Bulkhead DUO125Duotight Push-In Fitting – 9.5mm (3/8 in.) Female Bulkhead DUO125

Pluto Beverage GunPluto Beverage Gun

Carbonation and Line Cleaning Ball Lock Cap

Foam on Beer Detector (FOB)

Oxygen Flow Meter w/ Duotight FittingsDuoTight Compatible Locking Clips

And… More

More DuoTight Reviews on How-To’s!

DuoTights are so amazing – at least in my book 🙂 – that I have several reviews and related top posts. These are mostly linked in this review, but here’s a rundown for quick reference.

More Kegland Gear Reviews!

intertap faucet review

More Homebrew Finds!

Recent Deals!

10 Most Recent Homebrew Resource Posts & How-To’s!

We are Homebrew Review HQ!  Our 10 Most Recent Reviews

Also: Kegerator Tips & Gear | Keg Repair Part #s | Recent Keg Finds

Our Top Draft Resources!

Price, promotions and availability can change quickly. Check the product page for current price, description and availability.

Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions. review:duotight tag:tpr rs:6

4 thoughts on “Hands on Review: Kegland DuoTight Fittings & EVABarrier Tubing!

  1. Richard

    I usually love KegLands products but twice in the last few months I had an 8mm Tee and an 8mm coupling literally fall apart. One of the end caps on each of the fittings separated from the body and just fell to pieces. They were both used on 12psi CO2 systems and at different times. Needless to say, I lost 2 different cylinders of CO2. Expensive. The fittings were not cheap and this is just not supposed to happen. I complained to KegLand but all I got was basically “Sorry, we sell millions and this does not happen”. Guess I am the lucky one. I will go back to the double wall red tube with clamps. Never had that system fail.

  2. Richard

    Why aren’t all of the fittings on Amazon where you can buy a few without paying outrageous shipping charges.


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