BlowTie Diaphragm Spunding Valve Complete Kit

BlowTie Diaphragm Spunding Valve Complete Kit

Item currently out of stock

Due to high demand, this item is currently out of stock. Be the first to receive your items by placing a pre-order today. We will automatically ship this to you when we receive more inventory.
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


Prebook Item: Please note this item is not currently in stock, but is available for Pre-Order. We do require payment in full in order to reserve stock.
Item # FE961
Weight 0.39 LBS
Community Q&A

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 3 questions Browse 3 questions and 52 answers
Why did you choose this?
MoreFlavor Store
Feedback from friend
Jonathan C on Sep 26, 2021
pressure fermentation
Zack G on Sep 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 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
Fiona S on Jan 13, 2021
To pressure ferment
Will S on Jan 13, 2021
Quick Ferment LAGER
Barnard, J on Jan 8, 2021
Pressure fermentation
Anil V on Jan 8, 2021
ferment under pressure and value
Gary A on Jan 6, 2021
Need for pressure fermenting
Christopher D on Dec 31, 2020
Pressure fermenting in a keg
Stephen S on Dec 17, 2020
Better then one I got
Rick T on Dec 16, 2020
Corny keg pressure fermentation
Steven B on Dec 15, 2020
The description
Clements S on Dec 14, 2020
Will pressure ferment in the future.
Samuel Jason N on Dec 14, 2020
pressure fermentation
Steve J on Dec 12, 2020
Faye A on Dec 11, 2020
lagers bro
Nicholas A on Dec 10, 2020
works out of the box not configuration
James K on Dec 8, 2020
gift suggested by son
Terry L on Nov 25, 2020
Pressurized fermentation
Bill M on Nov 18, 2020
pressurized fermentation
Kevin B on Nov 16, 2020
Corny keg fermenting under a bit of pressure for pilsner, and also for transfer to serving keg.
Jesse K on Nov 16, 2020
I want valve that can be easily cleaned
Kris C on Oct 24, 2020
recommended by David Heath on youtube.
Chris E on Oct 20, 2020
Carbonation on my lagers
Kevin R on Oct 20, 2020
For pressurized fermentation
Brian M on Aug 29, 2020
Diaphragm is much better than a piston type.
Jonathan S on Aug 26, 2020
Making more lagers these days
John F on Aug 25, 2020
To make pressure fermented mead and cider and perry
Jose A on Aug 25, 2020
fermenting under pressure
Phillip C on Aug 10, 2020
So I can ferment under pressure
Valued C on Jul 10, 2020
Justin G on Jun 25, 2020
previous spunding valve did not function well enough
joshua m on Sep 24, 2021
For pressure fermentation
Ricky J on Sep 18, 2021
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
28 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 5 out of 5
This diaphragms supding valve is an upgrade over the poppet style.
October 18, 2021
1 week ago
Rated 5 out of 5
Excellent product
The bow tie is worth the money. I use it for several different task. I would recommend this product to anyone.
Love the bow tie it’s awesome
Love the bow tie it’s awesome
August 18, 2021
2 months ago
Rated 5 out of 5
Zero complaints!
I've used this for a handful of pressurized fermentations and transfers with zero issues. Super easy to dismantle and clean if krausen/wort manages to get into the valve.
April 21, 2021
9 months ago
Rated 5 out of 5
Great spunding valve!
I bought this valve because I had trouble with another style spunding valve. This one worked fantastic. I would recommend this valve if you want to easily pressure ferment!
April 20, 2021
8 months ago
Rated 5 out of 5
a necessity for all home brewers
April 2, 2021
7 months ago
Rated 3 out of 5
Valve installed backwards
After struggling with using for three different batches I realized the valve was installed backwards. Easy to fix and working now. Check the direction of the arrow on the side of the valve.
March 25, 2021
1 year ago
Rated 3 out of 5
I'm guessing it's okay
Did my brewing using my Fermzilla for the second time. Put this on and away we go. Fermentation starts and I try adjusting this one way and the other and it isn't venting. I'm starting to worry as it's a Monday and MoreBeer is closed. Ended up getting a (newer?) replacement at another shop and it works great. When I watched the vid on this they were explaining how to assemble it. Mine was assembled when I got it. Did some looking at it and it would appear that the diaphragm on the end was attached with the flow indicator backward. I'll return it and get another recipe kit. 3 star for it not working but not lower as the new one from the same vendor seems to work just fine.
March 13, 2021
Rated 4 out of 5
Great product, would have given 5 stars except for a couple issues
So far it works good, mine came in a different configuration than shown above, which worries me if I’m filling a keg and foam gets in the line and could get into the gauge. I don’t know how those fittings work so I haven’t reoriented the gauge. Also the gauge has slipped out causing gas leak.
User submitted image
Added Jan 26, 2021
January 26, 2021
9 months ago
Rated 5 out of 5
Works as it should...
January 26, 2021
9 months ago
Rated 5 out of 5
Fermented a lager warm in a corny keg with this attachment and the beer came out clean and almost fully carbonated.
January 21, 2021
10 months ago