Duotight Push-In Fitting - 8 mm (5/16 in.) Check Valve

Duotight Push-In Fitting - 8 mm (5/16 in.) Check Valve

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This Duotight check valve is a great idea for protecting your regulator or add it in line with your mains water pressure when using the KegLand Continuous Soda Carbonator Keg Lid. It has a low opening pressure of 1 psi. This check valve is suitable for clean liquids such as water or for gas. Since it cannot be disassembled for cleaning, we do not recommend it for beverage applications. The internal components are made from stainless steel. Compatible with EVABarrier 8 mm OD Tubing (D1717 & D1718).
Duotight fittings are high-quality push-in fittings that seal tight and offer superior sealing capacity due to the double O-ring sealing design.
High Performance Double O-Ring Design:
The secret to Duotight’s superior sealing performance comes from the fact that they use not one, but two high-quality EPDM O-rings.  The double O-ring means they have literally twice the sealing surface when compared with other push-in fittings.  This makes them more reliable and significantly reduces the chance of leakage.
The double O-ring system also means that tubing can be bent at a much tighter radius without causing leaking issues, which can be an issue with other fittings.  This combination of factors makes Duotight the most reliable push-in fittings on the market.
EPDM offers excellent chemical resistance for a longer life span. When compared with silicone and vinyl, EPDM has much better gas transmission rates, better wear resistance, and is BPA-free.
No Clamps Necessary!
We recommend cutting your tubing straight, not on an angle, to ensure the line forms a complete seal. To remove the fitting simply push in the collet and the hose can be removed.
  • Insert tubing and firmly push to connect
  • Easily release tubing by pushing in the collet
  • Suitable for both gas & water applications
  • Made from food-grade acetal plastic
  • Double O-rings made from highly chemical resistant EPDM
  • Locking teeth made from stainless steel
  • Pressure rated to 150 psi
  • Temperature rated to 212°F (100°C)

Please note: exposure to chlorine will degrade the acetal plastic and stainless steel these fittings are made from. Do not use in contact with bleach or other chlorinated cleaning chemicals.

Kegland Part number: KL07047Kegland Part number: KL07047

Item # DUO110
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - Out Of Stock
Weight 0.05 LBS
Community Q&A

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Browse 2 questions Browse 2 questions and 6 answers
Why did you choose this?
MoreFlavor Store
switching my Tap Rite regulator to DuoTight.
Alastair B P on Mar 2, 2023
Additional Regulator Protection on Gas Input line on WilliamsWarn BrewBottler Counter Pressure Bottle Filler.
David Lange on Feb 20, 2023
switching my Tap Rite regulator to DuoTight.
Alastair B P on Mar 2, 2023
Save my regulators
Jason W on Feb 21, 2023
Additional Regulator Protection on Gas Input line on WilliamsWarn BrewBottler Counter Pressure Bottle Filler.
David Lange on Feb 20, 2023
I picked this because the check-valves in your manifolds leak like a sieve.
Robert F on Feb 13, 2023
same as above
Daryl T on Feb 11, 2023
Had beer go back into air line
Valued C on Feb 10, 2023
You know how when you are drinking milk, someone tells a funny joke, you laugh unexpectedly and get milk up your nose? It's like that.. kinda.
Carl S on Dec 16, 2022
Stop backflow into gas, line easy to connect
Joseph P on Dec 2, 2022
Converting from.crimp on fittings to push in fittings.
Carl S on Dec 2, 2022
To protect my mini regulators
Maarten Wentink on Nov 21, 2022
Using in my Keezer to split my gas line to different kegs
Eric C on Oct 20, 2022
Prevent backflow of water into gas line
Ben D on Oct 19, 2022
to avoid beer into my regulator and co2 tank when it gets empty
Changing my keg system to use only DuoTight and EVABarrier
Lloyd M on Sep 20, 2022
For use with Komos Regulator
Iain M on Jun 23, 2022
To go with inline regulator
Patrick S on Jun 13, 2022
Super convenient
Patrick S on May 26, 2022
I had beer back up into my regulator
Sea Rogers W on May 24, 2022
David B on May 24, 2022
prevent backflow
Mark L on Apr 22, 2022
protect regulator
Kyle Z on Apr 13, 2022
So beer doesn’t backflow into my regulator
Gil P on Apr 7, 2022
Complete rebuild of gas side in my Kegerator.
Trevor W on Apr 6, 2022
Protect my regulators
Valued C on Apr 6, 2022
More beer
Matthew Brasee on Mar 30, 2022
converting a used kegerator to new/modern beer lines
David J on Mar 10, 2022
to have extras on hand
john marrano on Feb 8, 2022
Making a push connect manifold on my gas side
Geoff S on Feb 7, 2022
Want to be sure I'm not geting back flow into my kegs
Gary C on Jan 22, 2022
I need it
Michael S on Jan 22, 2022
prevent back-flow in 8 mm EVABarrier
Christopher N L on Jan 8, 2022
Regulator protection
Stephen L on Dec 30, 2021
To stop carbonation from going back into our house water.
D Paul M D on Dec 16, 2021
Protect my gauges
John E on Dec 2, 2021
Parts for a custom built 8-tap kegerator.
Kyle Heon on Dec 2, 2021
keezer and fermentation fridge parts
George S on Nov 17, 2021
Multiple kegs running different pressures and gas charging on the liquid line to prevent backflow into your gas lines.
Jonathan N on Nov 16, 2021
Converting Keezer from Poly to EVA
Mike D on Oct 21, 2021
protect my regulators
Chris Dornbach on Jul 9, 2021
Each gas line should have one in case of a low pressure (empty cylinder) event, to prevent fluids from backflowing.
Bradley M on Jun 9, 2021
Reduce risks from beer going into my gas lines
Mauricio Aguilar S on Jun 4, 2021
Want extras
Nicholas C T on May 31, 2021
I want to add check valves to
Jeff M on Apr 16, 2021
Least cost to do the job
Krista T on Mar 26, 2021
great in-line application
Andrew H on Feb 26, 2021
converting to all duotight - this is for the gas side
Andrew H on Feb 12, 2021
need it
MARVIN M on Jan 22, 2021
redoing my kezzer and want to simplify my system heard of these on Brulosophy
Paul K on Jan 6, 2021
Shilah M on Dec 17, 2020
keep beer from running up the gas line
Matthew Sabin on Dec 15, 2020
Save my regulators
Jason W on Feb 21, 2023
I picked this because the check-valves in your manifolds leak like a sieve.
Robert F on Feb 13, 2023
I'm using the mini regulators for each of my kegs. Where would I put the check valve?
{CO2 Tank Reg} > {Mini Reg} > {Check Valve} > {Keg}
{CO2 Tank Reg} > {Check Valve} > {Mini Reg} > {Keg}
Gary Haygood on Feb 24, 2023
BEST ANSWER: Correction to my previous answer. I initially didn't notice that this check valve is not rated for liquids like beer. That being the case, the check valve needs to go between the CO2 tank regulator and the mini regulator.
Where do I connect it?
Dmytro Dobrovolskyi on Dec 13, 2021
BEST ANSWER: Between the ball lock and manifold or tank on the gas side. Make sure the arrow is going toward the keg so gas can flow to the keg.

4.4 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 3 out of 5
faulty check valve?
I got these, like others, to prevent beer going back into the gas system when a keg is filled to the top. However, this one failed in its duties. Or am I using it wrong?
liquid flowed through the check valve
liquid flowed through the check valve
September 13, 2023
11 months ago
Rated 3 out of 5
Okay for water, but not for CO2
I have one of these on my continuous carbonated water keg's input water line. That works fine with just a very faint hum when the water flows. Installed on my CO2 lines, they made an embarrassing and annoying loud squeal with every pour. I removed them and replaced them with stainless check valves on each CO2 line - no more squeal. I have seen that Duotight makes a similar check valve specifically for gas lines that might work better for CO2, but I've only seen it for sale at one vendor in Canada, so haven't tried it.
April 28, 2023
8 months ago
Rated 5 out of 5
DuoTight Fittings
As with all DuoTight Fittings, this check valve works perfectly.
February 27, 2023
7 months ago
Rated 3 out of 5
I inserted these when I added a second keg to my kegerator. They are doing their job and prevent liquid from back flowing into my co2 regulator but the reason I gave only a 3 star rating is because I now have an annoying whistling sound when I pour. Still searching for a solution but I may have to switch to a double feed regulator.
January 4, 2023
9 months ago
Rated 5 out of 5
Gets job done
Works great. Great for keeping beer out of the gas line
December 26, 2022
9 months ago
Rated 5 out of 5
Duotight Push-In Fitting - 8 mm (5/16 in.) Check Valve
No problems so far. Seems to work.
August 30, 2022
1 year ago
Rated 5 out of 5
Ch-ch-check your valve before you wreck your valve
Bought to go in-line on gas manifold
February 20, 2022
1 year ago
Rated 5 out of 5
Love them. Keeping my gas line clean of liquid due to pressure equalizing.
October 25, 2021
1 year ago
Rated 5 out of 5
No leaks, easy to hook up lines
March 22, 2021
over 2 years ago
Rated 5 out of 5
Not much to say...it's a good check valve :)
July 9, 2020
over 3 years ago