90 reviews
  • FLEX+
  • FLEX+
  • FLEX+



**Due to high demand the current lead time is 3-4 weeks**

Introducing the new Spike Flex+! The Flex+ was designed to be the most versatile, upgradable and longest lasting small batch fermenter on the market. With currently over 20 accessories (and counting) you'll never run out of run toys to bling your Flex out with. The Flex+ is the big brother to the standard Flex. Out of the box it features an upgraded tri-clamp racking arm, tri-clamp butterfly valve and upgraded high pressure lid and clamp that can handle up to 15psi. The higher pressure rating allows for carbonating your beer in the same tank you fermenter in. Carbonate your beer in 24hrs opposed to 7 days!

You can view all the Flex+ accessories HERE.

All hardware shown HERE is included!

Flex Features:
-304 stainless steel; 1.2mm (18ga)
-All sanitary welded ports (no-weldless fittings)
-Designed for 2.5 to 6gal batches
    -7gal total capacity
-15psi working pressure
    -Use for pressure transfers
    -Use as a brite tank
-Etched volume markings
-Fully polished finish

-15" wide by 21¨ tall (to top of 4" TC)
-See additional dimensions here

Lid Features:
-Stainless band clamp for attaching the lid
    -Completely removable lid for easy cleaning
-4" TC modular top port
    -Allows for hop additions, temp control coil, top sight glass, etc

-(3) 1.5" TC ports which allow for: 

Blow Off Port – Dedicated port for an airlock or blow off tube
Hop Port – Dedicated port for adding hops
PRV Port – Dedicated port for your pressure relief valve (PRV)

Body Features:
-1.5" TC racking port with rotatable racking arm
-1.5" TC secondary port for thermometer, sample valve, etc

Flex Buyer's Guide

New to brewing? Haven't bought a Spike fermenter but feeling overwhelmed with the options? Well, we put together a Buyer's Guide just for you!

3 Port Lid Advantages

Racking Arm Included

  • Racking Arm
  • The Flex+ includes a tri-clamp rotatable racking arm as a standard item. This allows you to rotate the racking arm as you drain your Flex+. You’ll start draining in the upwards position and rotate until the beer stops running clear. The Flex+ comes with a racking arm that has an indicator so you can easily see what orientation the racking arm is at from the outside.


4" Lid Port

      • Lid port
      • The Flex+ features a 4” tri-clamp welded onto the lid. Why? Modularity. This allows you to attach our drop in temp control coil, clear cap and allows for easy hop additions. Our temp control coil extends deep into the Flex so both full batches (5-6gal) and half batches (2.5-3gal) can be efficiently cooled. The 4” port also allows for unmatched simplicity when adding hops during your fermentation. Gone are the days of removing the entire lid which allows oxygen in and also opens the door for an infection.


TC100 Full Temp Control Package

  • Temp control is arguably the most important aspect of brewing. Proper temperature control can eliminate off flavors and manipulate flavor profiles that different yeasts produce at different temps. Up until this point precise fermentation temp control was only available on larger more expensive fermenters – not anymore. Our full temp control package includes the temp coil, insulated tubing, quick connect tube fittings, cooling pump, insulated jacket and dual temp controller. We also have a heater available for us cold weather brewers. All that’s needed for cooling is a cold water source! Many people use a cooler with ice, fridge with a glycol reservoir or even a glycol chiller!


Primary, Secondary, Carbonate and Pressure Transfer

      • Pressure Transfers
      • We feel the Flex is the most versatile fermentation vessel on the market for the price point. The Flex+ can accomplish everything tanks 2-3 times its cost can do. You’ll easily be able to primary, secondary, carbonate (brite) and pressure transfer with one vessel!


Customer Reviews
4.9 Based on 90 Reviews
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Filter Reviews:
maarten r.
United States United States
not being used for beer

HI all, WE are successfully using your setup to leak test epoxy potted flanges. Very happy with the results, not happy of course that the fermenter will never come into contact with any beer at all. One small negative is that we bought the casters. It's pretty clear they are unusable without the triangular plate you also sell. I did not realize how necessary the plate is. I recommend you don't sell the casters or the plate separately, but sell them as a kit only. It would have saved me the trouble of figuring out that without the plate the whole setup on casters is too unstable to be practical. No big deal overall, we are happy with our leak testing setup for our factory.

Brian W.
I switched from a plastic

I switched from a plastic conical for the Flex+ and do not regret it. Great quality and beautiful. This does everything my co iCal did plus some.

  • Ease of use
  • Recommendation
  • Value
Rich W.
Love it!

Love it!

  • Ease of use
  • Recommendation
  • Value
Eric F.

I have two of them. I need another two. Worth every penny

  • Ease of use
  • Recommendation
  • Value
Ronald B.
Worked like a charm. Fit

Worked like a charm. Fit 5.50 gallons no problem. Bought the cooling package and the closed pressure transfer kit which were both awesome! Used a bucket of water chilled to 45 in my fermentation freezer to chill, had no issues. Maneuvering and handling it was pretty easy as well. Cleanup was a snap even in the Kitchen sink. I'll be purchasing a second one for sure.

  • Ease of use
  • Recommendation
  • Value