Duotight BlowTie 2 | Complete Kit | Diaphragm Spunding Valve | Built-In Pressure Gauge | 0-15 PSI | 8 mm Duotight | CM Becker Ball Lock Quick Disconnect (QD)

Duotight BlowTie 2 | Complete Kit | Diaphragm Spunding Valve | Built-In Pressure Gauge | 0-15 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
  • Built-in pressure gauge for easy reference when adjusting the spunding valve
  • Pressure gauge is interchangeable—swap to different pressure ranges that better suit your application
  • Diaphragm spunding valves offer higher accuracy compared to spring & poppet spunding valves
  • Comes complete with ball lock QD, Duotight adapter, and rigid joiner

With this complete kit you'll be ready to use the BlowTie 2 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.

This version of the Spunding Valve Kit includes the CM Becker Ball Lock QD, often considered the finest quality in plastic ball lock quick disconnects, and an 8 mm Duotight Flare Adapter for connecting to the BlowTie.

The BlowTie 2 can also be upgraded with a Digital Mini Pressure Gauge.

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 2 w/ Integrated Pressure Gauge (0-15 psi)
  • CM Becker Gray Ball Lock Disconnect
  • Duotight Flare Fitting
  • 8 mm OD Rigid Plastic Joiner


Item # FE963
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.38 LBS
Community Q&A

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Why did you choose this?
MoreFlavor Store
Pressure fermentation
Paul J on Mar 2, 2023
fermenting in corny keg
Matthew S on Mar 1, 2023
Pressure fermentation
Paul J on Mar 2, 2023
Pressure fermentation
todd h on Mar 1, 2023
fermenting in corny keg
Matthew S on Mar 1, 2023
Good reviews online.
Jason B on Feb 6, 2023
Hoping the hype about cleaner ferments at higher temps cuz AZ gets really hot.
Clifton Lawson on Jan 28, 2023
Good reviews
Valued C on Jan 27, 2023
Jon O on Jan 19, 2023
Reasonable price and I am in need for one.
Matthew William L on Jan 17, 2023
Pressure fermenting and carbonating kegs
Jacob M on Jan 12, 2023
Closed fermentation
Carlos on Dec 27, 2022
I want to explore pressure fermentation
JAMES S on Dec 23, 2022
It's nice
Jason K on Dec 9, 2022
the only way to get the right pressurize of the fermzilla accurately
robert wallace on Nov 30, 2022
Need to carbonate a beer quicker for a party!
Evan K on Oct 14, 2022
pressurized transfers
Anthony DeWitt on Sep 28, 2022
Pressure Fermentation
Darien W on Sep 23, 2022
excellent rating and price
Dan J on Sep 2, 2022
right product available in timely manner
Paul K on Aug 4, 2022
Pressure fermentation in keg
Doug N on Jul 26, 2022
Previous set up malfunctioning
Jeffrey Z on Jul 1, 2022
So much cheaper than a glycol jacketed fermenter!
Joshua B on Jun 28, 2022
excellent product
john r on Jun 6, 2022
So that, I can start fermenting under pressure safely, and effectively with my Fermzilla.
Michael C on May 13, 2022
Need it
Derek J B on Apr 27, 2022
Pressurized fermentations and transfers
Chris R on Apr 26, 2022
Might as well add pressure fermentation capability now that I am in the 6 gallon kegs.
Nick P on Apr 25, 2022
to pressure ferment
Ian W B on Apr 17, 2022
For carbonating during fermentation, pressure transfers, and releasing pressure from over carbonated kegs
Justin Ragsdale on Apr 6, 2022
i need one. reasonably priced.
Ken F on Mar 31, 2022
pressure fermentation
jonthan k on Feb 19, 2022
Pressure fermenter
Connor M on Feb 18, 2022
keg fermenting and closed keg-to-keg transfers
Doc Farmer on Feb 7, 2022
to fill kegs from a brite tank
Alejandro R on Feb 4, 2022
I want to ferment under pressure in a corny keg
Kevin K on Jan 22, 2022
Pressure transfer to keg
William Brennan on Jan 11, 2022
Pressure fermentation
Sarah k on Jan 10, 2022
ferment in keg
Jerry M on Jan 3, 2022
new version of spunding valve
Robert H on Dec 22, 2021
To pressure ferment
Michael Gann on Dec 7, 2021
My son is a home brewer and he requested this for Christmas.
Margie N on Dec 7, 2021
Fabio S on Dec 1, 2021
Used with pressure fermenter. I hold the pressure at 10 pounds during the fermentation.
Murray Alan H on Nov 20, 2021
To ferment under pressure
Tyson S on Oct 1, 2021
Because I want to make lager beers in a week, like some kind of space alien witchcraft
brian r on Sep 30, 2021
Pressure transfers
Jason S on Aug 19, 2021
trying something new with kegging
curtis g on Jul 7, 2021
Needing a way to control fermentation pressures
Tyler Easton on Jul 3, 2021
Pressure fermentation
todd h on Mar 1, 2023
Good reviews online.
Jason B on Feb 6, 2023
Is there a pin lock version?
Annabritt E Coakley on Jul 11, 2021
BEST ANSWER: The Duotight Flare fitting is easily transferred to a pinlock fitting. It will fit on all standard 1/4" flare fittings in your toolbox.

4.2 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 2 out of 5
Pressure gage doesn't work, have pressure in Fermzilla but gages reads 0. Ordered the Digital replacement
March 5, 2023
1 year ago
Response from MoreFlavor
We are so sorry to hear about your bad experience with the BlowTie 2 Spunding Valve. You are still within our return policy window. Please go to our website, scroll to the bottom of the page, and use the Return an Item form and we will set you up. Cheers!
March 8, 2023
Rated 4 out of 5
can tell how accurate it is.
Working on a sparkling hard cider in the Fermzilla. Wanted to carbonate the cider at 20 PSI for week. After a week the Blowtie says 2. Hook up the CO2 cylinder. It says 10. I kick up the CO2 back to 20 PSI and the Blowtie says 10. I have another analog gas gauge that says 15. So I guess the old adage about a person with two clocks in never sure of the correct time.
December 14, 2022
1 year ago
Rated 5 out of 5
Perfect for pressurized transfers
I had never tried a pressurized transfer (keg to keg, or fermenter to keg), but I found this spunding valve when searching online. It comes preassembled, you just clamp it on to the gas post of your destination keg, and then use the yellow valve to control the flow of liquid into the keg. It was simple, effective, and well worth the price.
October 5, 2022
1 year ago
Rated 5 out of 5
Highly functional - Practice makes perfect
Works appropriately and effectively. Holds pressure and no leaks. Highly recommended.

Hint: Set the pressure on the spunding valve prior to filling your vessel with wort using your existing CO2 setup. This will prevent a sputtering krausen mess during fermentation.

Double hint: Kegland has a disassembly video if/when you need to disassemble to clean.
July 19, 2022
1 year ago
Rated 5 out of 5
Easy to use
I ordered this to pressure ferment a lager. First time ever doing a pressure fermentation in the fermzilla came out perfect and delicious.
June 30, 2022
over 2 years ago
Rated 4 out of 5
Spunding valve works great, Gauge accuracy is questionable
The spunding valve is easy to set and works really well. When using the 0-60psi gauge (sold separately), it's not very accurate. I would say it's a least 5 psi off. But it's not a problem for me, since I use the pressure gauge on my CO2 tank to set the spunding valve anyway.
April 11, 2022
over 2 years ago
Rated 3 out of 5
Would be a “complete” kit if it came with some tubing
Didn’t realize that the complete kit required some EVABarrier 8 mm Tubing to… complete it.
March 14, 2022
over 2 years ago
Rated 5 out of 5
Working well so far on second brew right now
January 2, 2022
over 2 years ago
Rated 5 out of 5
easy addition
These were so easy to adjust and add to my system since it had a gas post on the lid.
December 20, 2021
over 2 years ago
Rated 4 out of 5
works but knob feels loose below ~2 psi
Using this for air-less transfer from fermenter to keg and feels like the adjustment knob is hanging on by a few threads at these low PSIs. Not a functional issue but does lack adjustability at this low pressure.
September 13, 2021
over 2 years ago