BlowTie Diaphragm Spunding Valve Complete Kit

BlowTie Diaphragm Spunding Valve Complete Kit

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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 - Out Of Stock
Pennsylvania - In Stock
Weight 0.39 LBS
Community Q&A

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Browse 3 questions Browse 3 questions and 52 answers
Why did you choose this?
MoreFlavor Store
For use to transfer beer from unitank to keg
Michael SJ Y on Nov 21, 2022
For pressure transfer to keg.
Andrew H on Aug 24, 2022
For use to transfer beer from unitank to keg
Michael SJ Y on Nov 21, 2022
To pressure brew
Carl Stevens 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 F on Aug 19, 2022
to start fermenting in kegs
Christopher W on Aug 9, 2022
to pressure ferment
Bradley M 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 Santillo 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 K 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
Need a spunding valve, and this one has a good reputation for little cost.
Michael S on Apr 14, 2021
For evaluation.
Mike Hoover on Apr 8, 2021
because I am going to ferment under pressure
Billy C on Apr 6, 2021
Going to pressure ferment in Kegs and like the option to hook a gas line to a second keg to purge it.
Andrew K on Mar 30, 2021
I have Fermentasaurus and am trying to improve my coldside technique.
Valued C on Mar 23, 2021
Under pressure
Nicholas S on Feb 24, 2021
will use for kegging along with flow stopper
Barry K on Feb 23, 2021
Price and its design
Trinidad G on Jan 29, 2021
Best possible reviews
Matthew P on Jan 28, 2021
To pressure brew
Carl Stevens on Nov 8, 2022
Pressure fermentation
Walter S on Aug 19, 2022
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: If some of the blow-off got into the guage, its likely been compromised and that would make it inaccurate.

4.3 / 5.0
37 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 3 out of 5
works mostly
if the foam cap gets anywhere near this thing its not gonna work.
September 15, 2022
4 months ago
Rated 5 out of 5
very easy to operate
August 23, 2022
3 months 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
3 months 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
4 months 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
4 months ago
Rated 5 out of 5
Blow tie
Works great used on an ipa that was awesome.
July 19, 2022
5 months 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
5 months ago
Rated 4 out of 5
Works well but beware of incorrect assembly!
The spunding valve came pre-assembled from MoreBeer. It worked perfectly once I figured out that the regulator had been installed backwards and would not bleed pressure no matter how much the pressure adjuster was turned out. That could've resulted in severe over-pressurization of the beer and fermenter. MoreBeer needs to tighten-up their quality control or someone could get hurt, or worse yet, ruin a perfectly good batch of beer!
June 14, 2022
5 months ago
Rated 4 out of 5
Don't let the plasic concern you.
Since the package that I received did not come with instructions and was assembled incorrectly, I would highly recommend going to YouTube and watch the assembly and use instructions. I also recommend purchasing additional 8 mm or 5/16 of tubing to help with the pressure settings. You will be glad you did.
December 15, 2021
12 months ago
Rated 5 out of 5
This diaphragms supding valve is an upgrade over the poppet style.
October 18, 2021
1 year ago