52 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 fun toys to bling your Flex out with. You can use the Flex as a simple bucket fermenter with an airlock or add some accessories to get you all the way up to a 15psi capable brite tank and anywhere in between!

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
-2psi working pressure
    -Strong seal to keep oxygen and bacteria out
    -Use for pressure transfers to your keg or bottling bucket
-Etched volume markings
-Fully polished finish

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

Lid Features:
-4" TC modular top port
    -Allows for hop additions, temp control coil, top sight glass, etc
-Airlock port

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!

Racking Arm Included

  • Racking Arm
  • The Spike Flex includes a 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. And since the Flex was designed to be modular, the full tri-clamp racking arm with a position indicator can be purchased at a later date as a cool new upgrade!


4" Lid Port

      • 4 inch Lid Port
      • The Spike 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!


Customer Reviews
4.9 Based on 52 Reviews
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United States United States
Just bottled my first batch

This is my first "real" fermenter after using buckets previously, so I was excited to receive my order. Unfortunately it was missing some gaskets for the tri clamps, customer service were excellent and sent them out after I asked, but it put my brew day back a week. I had seen one reviewer talking about plumbers tape for the valve, this is a MUST! I transferred into my fermenter only to have a steady drip from the connection, had to play pass the parcel between vessels while I added some. It would be nice if there was a note about needing this, or some instructions at all. The rest is all good, excellent build quality, nice and sturdy, fully expect to be using this forever.

United States United States
Great product and company

I purchased the spike flex and have been extremely happy with it. Just finished my first brew and the process was as easy as can be. Not to mention that this was my first time brewing beer ever, but the equipment made it easy. The company was extremely supportive through the process and answered any and all questions that I had. Keep up the great work!!!

Drew M.
I really enjoyed using my

I really enjoyed using my flex. It is extremely well made, I have no doubt that I will have this for as long as I keep the hobby. It’s also very easy to transfer and clean. I only have two minor complaints. I don’t see how I can position the large tri-camp on top so that it won’t interfere with one of the latches. And the hole for the airlock stopper is sharp and cuts into the rubber. All in all, I think it’s a great product and I’m very happy with my purchase.

  • Ease of use
  • Recommendation
  • Value
William B.
Spike Rocks!

I dont normally take the time to do these reviews but I will here. This is my second Spike product and I will say this..there is not another company out there that can match Spike for quality vs cost for the home brewer sector. Seriously..great job and I love not only this Flex fermenter but every single Spike product I have ever invested in. I bought the lower end Flex and it works like a high end model. No regrets. Top notch quality, company, and great pricing. Products that I know will last a lifetime! Spike for life!

  • Ease of use
  • Recommendation
  • Value
Patrick C.
Awesome product

This product is unbelievably well built. I had my doubts with the price, but still bought it. It is an icon in the kitchen now, & quite a conversation piece when we have company. Everyone that see's it is quite taken with the quality. I ran my first batch of Blackberries through it with out flaw. I highly recommend Spike & their products. You will not be disappointed!

  • Ease of use
  • Recommendation
  • Value