Duotight BlowTie | Complete Kit | Diaphragm Spunding Valve | Triple Scale Pressure Gauge | 0-40 PSI | 8 mm Duotight | CM Becker Ball Lock Quick Disconnect (QD)

Duotight BlowTie | Complete Kit | Diaphragm Spunding Valve | Triple Scale Pressure Gauge | 0-40 PSI | 8 mm Duotight | CM Becker Ball Lock Quick Disconnect (QD)

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  • Automatically release pressure inside your fermenter during pressure fermentations
  • Regulate beer flow during pressurized transfers from fermenter to keg
  • Large triple scale pressure gauge with extended 0-40 PSI pressure range
  • Diaphragm spunding valves offer higher accuracy compared to spring & poppet spunding valves
  • Comes complete with ball lock QD, Duotight adapter, tee, and rigid joiners

With this complete kit you'll be ready to use the Blow Tie Spunding Valve right out of the box. The BlowTie 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 to 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.

Kit Includes:

  • BlowTie
  • Pressure Gauge (0-40 psi)
  • Ball Lock Disconnect
  • Duotight Tee & Flared Duotight Fitting
  • 2x Lengths of EVABarrier 8mm OD Tubing


Item # FE961
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.39 LBS
Community Q&A

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Browse 4 questions Browse 4 questions and 3 answers
Why did you choose this?
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Pressure fermentation
Zachary S on Mar 1, 2023
pressure fermentation
Justin W Thomas on Feb 8, 2023
Pressure fermentation
Zachary S on Mar 1, 2023
Control pressurized fermentations.
John N on Feb 21, 2023
pressure fermentation
Justin W Thomas on Feb 8, 2023
Lagering a cider under pressure in a corny keg
Joseph M on Jan 30, 2023
Need for frement in keg
Marcus M on Jan 17, 2023
I finally have the ability to do a Ferm to Keg transfer
Rusty B on Jan 10, 2023
need it for fermenting
Matthew T on Dec 30, 2022
To pressure ferment and pressurized transfers from fermenter to keg
Sean Smart on Dec 16, 2022
lager brewing
leo on Dec 10, 2022
For use to transfer beer from unitank to keg
Michael SJ Y on Nov 21, 2022
To pressure brew
Carl S on Nov 8, 2022
For pressure transfer to keg.
Andrew H on Aug 24, 2022
Pressure fermentation
Walter S on Aug 19, 2022
Closed loop transfer to keg/secondary
Wesley Fincher on Aug 19, 2022
to start fermenting in kegs
Christopher W on Aug 9, 2022
to pressure ferment
Bradley Mercer on Aug 2, 2022
GAVIN R on Aug 2, 2022
I brew in 6 gal Torpedo kegs so I use Spunding Valves even if I don't pressure ferment all beers
Joseph on Jul 25, 2022
Has good ratings
Frank R on Jun 23, 2022
Pressure transfer
Dan R on May 23, 2022
Pressure transfer
MIchael M on May 11, 2022
John T on Apr 19, 2022
Ferment In Keg
Michael E on Apr 13, 2022
Want to stat pressure fermenting
Phillip A on Apr 2, 2022
I like that larger gauge and the bow tie seems to the the most reliable spunding valve.
Michael F on Mar 25, 2022
Jack L on Mar 19, 2022
Pressure transfer from conical
Lee B on Mar 19, 2022
For pressure fermenting in a corny keg
Brian B on Mar 18, 2022
Pressure fermentation
John H on Mar 8, 2022
Keg to keg transfer.
Dan Shaffer on Feb 19, 2022
pressure fermentation
jonthan k on Feb 19, 2022
good reviews
Mark G on Feb 10, 2022
why not
Jerry M on Feb 1, 2022
Jason C on Jan 31, 2022
For closed transfers from fermenter to keg
Joshua L on Jan 22, 2022
To do pressurized fermentations
Mike S on Dec 18, 2021
To safely ferment beer under pressure.
David K on Nov 24, 2021
Pressure fermentation
Annabritt E Coakley on Nov 19, 2021
Feedback from friend
Jonathan C on Sep 26, 2021
previous spunding valve did not function well enough
joshua m on Sep 24, 2021
pressure fermentation
Zack G on Sep 19, 2021
For pressure fermentation
Ricky J on Sep 18, 2021
Going to ferment in a keg and pressure transfer
Michael J on Aug 9, 2021
Regulate the pressure of a pressure fermentation
Jesse G on Aug 5, 2021
To pressure ferment cider in keg in one step
Gregory P on Jun 23, 2021
Works great and I need in case I have 2 beers to ferment at same time.
Josh Lamb on Jun 15, 2021
Keg conditioning
Gail Kahle on Jun 12, 2021
David Heath Homebrew review
William P. H on May 18, 2021
pressure fermentation
Michael E on May 5, 2021
Pressure fermentation
Javier C on Apr 22, 2021
Control pressurized fermentations.
John N on Feb 21, 2023
Lagering a cider under pressure in a corny keg
Joseph M on Jan 30, 2023
How should the pressure gauge be cleaned? Is it ok to soak in cleaning solution?
Matthew Reardon on Aug 7, 2021
BEST ANSWER: It’s plugged in on the gas side, the chance being contaminated is very low. However soaking the connector in StatSan should be fine but not the gauge.
Why is my pressure fluctuating wildly? I set my psi to 10 on a clean corny keg before I started pressure fermentation. The last 2 days it’s been a nightmare. Randomly up to 30psi, blow outs through the spunding valve, it’s been a bad first experience that’s for sure
Richard Frame on Jun 29, 2021
BEST ANSWER: Make sure BlowTie spunding valve has arrow pointing away from the incoming (pressure-side) tube. Mine arrived improperly assembled.
Is this one way? Meaning can I use it as my airlock during fermentation, having it completely open letting co2 out? Or will air get in the fermentor?
Matt Mcdonald on Nov 14, 2023
Anyone else having a hard time getting this to lock on??? It wont click and almost seems like the wrong size??
Matt Mcdonald on May 3, 2023

4.2 / 5.0
40 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 1 out of 5
Defective and Disappointing
As others have noted, the fully assembled valve kit comes reversed and will not release pressure. I also found it impossible to engage the disconnects without damaging the tubing. Cheap plastic everything. I have requested a refund and will find another product.
January 4, 2024
Rated 3 out of 5
Received this fully-assembled unit a few days ago. The BlowTie spunding valve was hooked up on the output side of the valve (arrow pointing at tube). One minute of frustration. But, many may not check, given it is already assembled. Flipped tube to other side, and it seems OK now.

Gauge at 4.5 PSI with no pressure on it. Yes, I tried "burping" it. No dice. I hope this all works. None of this is confidence building.
September 19, 2023
Rated 5 out of 5
BlowTie or Die!
I have used a couple different spunding valves and even built my own. All of those, however, used the spring and poppet pressure relief valve. Wanting a greater degree of accuracy, I decided to order a BlowTie spunding valve. The diaphragm PRV makes such a big difference when trying to maintain a set pressure! Perfect for pressure fermentation. I wish I had gotten one from the get go!

I'm not generally a fan of more plastic in my "brewhouse" (garage), but in this case it's beneficial. I use fermcap to keep kraeusen under control, but it's no guarantee. If the BlowTie does get high kraeusen in it, it's very easy to clean and sanitize before using again. The duotight fittings make it super easy to take apart, and being unthreaded, easier to clean.

On top of everything else, it's a great price! It's not much more expensive than the cheapest spunding valves on the market, and cheaper than building your own. The performance is second to none. BlowTie is the clear choice when selecting spunding valves (at the homebrew level at least).
January 15, 2023
1 year ago
Rated 3 out of 5
works mostly
if the foam cap gets anywhere near this thing its not gonna work.
September 15, 2022
1 year ago
Rated 5 out of 5
very easy to operate
August 23, 2022
1 year ago
Rated 4 out of 5
This works, but don't expect perfection... It is a plastic valve that isn't as smooth as a metal one would be but overall it works. You will just need to adjust it so keep an eye on it until it's dialed in for the pressure you want... Would I buy it again... Yes I would
August 16, 2022
1 year ago
Rated 5 out of 5
It Works
I have just gotten into pressure fermenting and it is GREAT and this Spunding valve works GREAT. The only thing that you have to watch out for is after taking it apart for cleaning (not the valve) is the flow direction it is hard to see the arrow on the valve.
August 14, 2022
1 year ago
Rated 4 out of 5
Watch for backwards valve installation
Everything is fine with my BlowTie and it is working great, but I inspected it before use and found that the valve was installed backwards.

It's an easy fix because of the DuoTight fittings, but it's something that could be a potential safety issue if not caught. Based on other reviews, I'm not the only person who has come across this issue.
July 25, 2022
1 year ago
Rated 5 out of 5
Blow tie
Works great used on an ipa that was awesome.
July 19, 2022
1 year ago
Rated 5 out of 5
Ferment under pressure
Great accessory to hold a consistent pressure for fermentation under pressure. Attached mine to the fermzilla.
July 7, 2022
1 year ago