BlowTie Diaphragm Spunding Valve

BlowTie Diaphragm Spunding Valve

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The Blow Tie Spunding Valve is used to release excess pressure on a pressurized fermenter or from a receiving keg during pressure transfers. This diaphragm spunding valve is much more accurate than the spring and poppet style, and works much better at lower pressures.
Pressure Fermentation
Pressure fermentation is becoming more and more popular at the homebrew level, but in order to do it safely and accurately you need a way to release excess pressure. You'll pressurize your vessel to your desired psi, but once fermentation begins and those hungry, active yeast start creating CO2, the pressure inside the vessel will increase. Attach a spunding valve and set it to your desired pressure, and it will blow off when the pressure gets too high and close up again when it's back to your desired psi.
Pressure Transfers
Even if you don't have a pressurizable fermenter, you may have done pressure transfers from keg to keg during filtering or after fining. During pressure transfers, it's a good idea to have a bit of head pressure in the receiving keg, especially if you're transferring beer that is already carbonated. Having a spunding valve in place will allow you to consistently control the head pressure and give you more consistent results, without losing carbonation in the process.
Diaphragm vs. Poppet
With the poppet style spunding valve, a spring pushes against a poppet to keep the valve closed. When the poppet lifts up to open, the surface area the gas pushes against becomes larger, and the spring has to work harder to push the poppet down and reseal the valve. This can lead to more gas being released than intended, and the remaining pressure in your vessel may be at a lower psi than your spunding valve’s set psi. 
Instead of a poppet, the spring inside the BlowTie pushes against a diaphragm, which has an immensely larger surface area. This means the surface area that the gas pushes against while the diaphragm is closed is significantly closer to the surface area it pushes against when the diaphragm is open. This leads to higher accuracy, and the remaining pressure after excess gas is released will be much closer to your set blow off pressure.
Set Up
The BlowTie spunding valve comes with 8 mm Duotight fittings on the inlet and outlet, and we recommend using it with EVABarrier 8 mm OD tubing (D1717 or D1718). You'll also need the flare Duotight fitting (DUO106) in order to attach it to a ball lock or pin lock disconnect. Dialing in your desired pressure is very simple. Although you would ideally use the BlowTie with the Push-In Pressure Gauge (D1160) and Duotight Tee Fitting (DUO109), as seen in the example photo, you can easily set the blow off pressure without it. To do this, simply pressurize an empty keg to your desired psi using your CO2 regulator. Before attaching the BlowTie to the gas post, be sure to turn the dial clockwise until it is fully closed. Once attached, slowly turn the dial counterclockwise until gas starts coming out, then slightly turn the dial back to stop the gas flow. The BlowTie is now set to your desired pressure.
  • Made from food grade acetal
  • Stainless screws
  • Easily disassembles for cleaning
  • 8mm (5/16") Duotight fittings at both ends
  • 0-40 psi pressure rating


Please note: the BlowTie does not come with the pictured accessories. Please see "You Might Also Need" below for the other products shown in the example photo. 

Kegland Part number: KL03643

Item # FE960
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.02 LBS
Community Q&A

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Why did you choose this?
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Just found out today that the 2 I previously purchased from you were both broken. Please don't send the white ones. Both leaked.
Ricardo F on Jul 27, 2022
cheaper option
Siri Hagen A on Jun 27, 2022
Just found out today that the 2 I previously purchased from you were both broken. Please don't send the white ones. Both leaked.
Ricardo F on Jul 27, 2022
Backup to valve in use
Walter Rutkoski on Jul 21, 2022
cheaper option
Siri Hagen A on Jun 27, 2022
I own one already and it works great, but bought a second pressure fermenter.
John Rettner on Apr 8, 2022
Pressurize fermentation
Got some beer in my current valve.
Todd on Nov 2, 2021
recommended for duotight flow stoper
Ted on Oct 8, 2021
Pressure fermentations and transfers
Will A on Aug 4, 2021
It’s undeniably harming ketchup and mustard color scheme. I only buy parts in primary colors.
Scott Lodwick on Apr 13, 2021
Keg filling
Kenny Lyons on Mar 30, 2021
going to pair it with flow stopper keg filler.
mark a on Feb 16, 2021
Seemed well reviewed
Jack C on Feb 11, 2021
Pressurized transfers
Will S on Jan 13, 2021
same as last
David W on Dec 24, 2020
John F on Aug 25, 2020
Replacing spring type on existing spunding valve and so can pass thru excess CO2 to purge kegs
Kurt H on Jul 25, 2020
pressure ferment and transfer control
Michael Dean on Jul 3, 2020
For keg filler
Joseph M on Jun 10, 2020
Orange and yellow
Sven G on May 28, 2020
to properly pressure ferment and transfer
Christopher E W on May 27, 2020
It's the best spunding valve I've found, works perfectly
William B on May 26, 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
For better accuracy
Justin B C on Apr 4, 2020
Great for fermenting under pressure and counter-pressure filling kegs!
The_Bishop on Mar 5, 2020
Pressure transfer of carbonated beer from conical.
Jeff Dahlseid on Mar 2, 2020
Pressurized keg fermentation
Stephen O on Feb 20, 2020
Good reviews
Andrew O on Feb 6, 2020
to prevent bubbles when I transfer with the duotight flow stopper
Mrob on Nov 12, 2019
Because I use one already and it's an excellent spunding valve
Keri L on Nov 1, 2019
Best available valve to build a spunding valve system
Lawrence W on Oct 29, 2019
More accurate than poppet style
Dwain Pannell on Oct 24, 2019
goes with my new Fermzilla to ferment under pressure
todd c on Oct 14, 2019
Just cause
Lucas A K on Sep 28, 2019
Saw a youtube video using this
Fits w other parts. Should be a sounding valve kit.
Adam P on May 9, 2019
I was having difficulty setting low pressure when using a regular spunding valve.
Richard K on Apr 20, 2019
Backup to valve in use
Walter Rutkoski on Jul 21, 2022
I own one already and it works great, but bought a second pressure fermenter.
John Rettner on Apr 8, 2022
How is this Duotight In-line Regulator different from the BlowTie Diaphragm Spunding Valve? Can the Duotight be used the same way?
Alex A Rivas on Mar 16, 2021
BlowTie Diaphragm Spunding Valve
BlowTie Diaphragm Spunding Valve
Duotight In-Line Regulator
Duotight In-Line Regulator
BEST ANSWER: The regulator controls pressure entering your keg. The spunding valve controls pressure leaving your keg. The regulator makes sure your keg is never below a set pressure. The spunding valve makes sure your keg is never above a set pressure. They do different jobs and are not interchangable.

4.6 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
Milkduds are def NOT yeast starter
Pretty great little gadget. If you haven’t switched to pressure fermentation get setup for it asap! The little pressure gauge for this is only available sporadically but you can manage without it - you just have to pay attention and always err on the side of pressure release rather than pressure storage.
August 16, 2021
1 year ago
Rated 5 out of 5
Better adjustability.
More precise adjustablity than my metal valves. Plastic seems durable enough.
February 26, 2021
over 2 years ago
Rated 3 out of 5
Works, but won't stop flow completely
Used for spunding. These will not stop flow completely at a set pressure--they leak a little. Put a valve somewhere in the line or disconnect when fermentation is complete. I prefer the more expensive metal body regulator I've been using for a while.
December 3, 2020
over 2 years ago
Rated 5 out of 5
Love it
Works as advertised! Great little unit
August 4, 2020
over 2 years ago
Rated 4 out of 5
Good little device
This is a great little device and helps not only as a Spunding valve pressure release but it also acts as a good way to fill kegs under pressure. Simple to use and inexpensive.
April 9, 2020
over 3 years ago
Rated 5 out of 5
Great product, worth it...great quality easy to use.
March 15, 2020
over 3 years ago
Rated 5 out of 5
Easy to use. Works well. No issues.
January 28, 2020
over 3 years ago
Rated 5 out of 5
Best Option Available at a Great Price!
I've been using various spunding valve builds for a few years and this is BY FAR the best option, and most straight-forward option available at a reasonable price to homebrewers. The build can be put together in about 30 seconds, and can come apart in the same amount of time. #LoveIt
November 23, 2019
over 3 years ago