FerMonster Carboy - Replacement Lid O-Ring

FerMonster Carboy - Replacement Lid O-Ring

In Stock
60 day no hassle return policy. Details

Replacement O-ring for the Fermonster Plastic Carboy lids (all sizes use same lid).  

The o-ring is a little tricky to install so please be sure to watch our video in the video tab on how to install it. 


Item # FE251
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.12 LBS
Community Q&A

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Browse 2 questions Browse 2 questions and 55 answers
Why did you choose this?
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For my new lid
Timothy L on Oct 13, 2020
just in case
Frank V on Sep 24, 2020
For my new lid
Timothy L on Oct 13, 2020
Can’t hurt to have a spare o ring
Blake F on Oct 6, 2020
just in case
Frank V on Sep 24, 2020
Just in case I need it in the future.
Felix B on Sep 24, 2020
Own one, it's good
Daniel R S on Sep 22, 2020
for backup.
Michael S on Sep 19, 2020
John S L on Sep 17, 2020
Replace existing rings
Ray W on Sep 9, 2020
Always a good idea to have a spare
Jack G on Aug 11, 2020
Spare Parts
Greg H on Aug 11, 2020
Because the replacement lids don't come with one standard!?!
Chris J on Aug 5, 2020
need a spare just in case
Wayne S on Jul 28, 2020
Can't hurt to have an extra.
Ralph J on Jul 9, 2020
I'm probably gonna ruin the original
Christopher M on Jun 23, 2020
May need
sean r on Jun 11, 2020
Better to have and not need than need and not have.
Douglas b g on May 21, 2020
Cause i need it
Dan P on May 13, 2020
I have an o ring that is starting to show wear.
Michael J on May 9, 2020
o rings...
Lucas C on May 1, 2020
extra parts are good to have
Brian B on Apr 30, 2020
need it
batman on Apr 24, 2020
Replacement for a nicked original ring
Greg G on Apr 7, 2020
always keep an extra
James D W on Feb 20, 2020
Because for some reason, a new lid for the Fermonster does not come with one.
Steven F on Feb 17, 2020
I hope it doesn't become necessary but why not -- just in case
Patrick M J on Feb 1, 2020
To have a spare
Jose Rodriguez on Jan 1, 2020
Spare Parts
Jason Nather on Nov 11, 2019
Spare parts seem prudent.
Gary Nalavany M on Oct 22, 2019
Need for solid lid
Clarence S on Oct 10, 2019
Need them
Todd Saunders on Oct 8, 2019
Dave W on Sep 17, 2019
Just in case
Valued C on Aug 28, 2019
Spares are important
Ethan C on Jul 19, 2019
Just as a spare.
Sammy K on May 25, 2019
As a back-up
Joshua O on Apr 23, 2019
Spare seals
Frederick B D on Apr 20, 2019
Future need
Catherine M on Apr 18, 2019
Always have spares
Paul R on Apr 16, 2019
Steve S on Feb 6, 2019
Just in case
Jose J. R on Jan 28, 2019
Michael H on Jan 19, 2019
My other ring got damaged
steve g on Jan 14, 2019
Gotta have a gasket.
MICHAEL W on Jan 3, 2019
For a backup
Valued C on Jan 3, 2019
Nice to have a spare
Andrew Ryan on Dec 21, 2018
replacement part
Benjamin E on Dec 18, 2018
Extras as hard to remove from lid . Want extra in case it breaks
William O on Nov 28, 2018
It's always good to have a replacement on hand
Allan M on Nov 19, 2018
Gene E on Nov 17, 2018
GARY N on Oct 9, 2018
Can’t hurt to have a spare o ring
Blake F on Oct 6, 2020
Just in case I need it in the future.
Felix B on Sep 24, 2020
Are these necessary it seems airtight without it?
Matt Mcdonald on Apr 30, 2018
BEST ANSWER: These are replacement/backup O-rings. The Fermonster ships with one.

4.5 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Works great just expensive for what it is.
May 3, 2020
over 2 years ago
I bought this for a spare at my age it is easy to lose or misplace things I use.
February 12, 2019
1 year ago
Ordered a couple to have on hand as these are small and thin and I'm sure will need to be replaced. The size if then though is odd as they are larger then ones I was finding locally so added them to order I was making to have extra of. Used originals now for a year and no issues.
September 10, 2018
over 2 years ago
It takes a little mucking about to get the o ring in place but they do seal well.
June 26, 2018
over 2 years ago