Fermonster - Replacement Lid O-Ring

Fermonster - Replacement Lid O-Ring

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Replaces lid o-ring for all sizes of Fermonster Plastic Carboys.

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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Need a solid lid and oring
Damien A on Jun 23, 2022
Erik A on Mar 30, 2022
Need a solid lid and oring
Damien A on Jun 23, 2022
I need it
Tim Y on May 6, 2022
Erik A on Mar 30, 2022
o-rings break
lawrence a b on Mar 10, 2022
Precautionary purchase.
Ryan R on Feb 26, 2022
Need it for the lid
Glenn N on Feb 24, 2022
New lid, new ring.
David P on Feb 17, 2022
the o-rings tend to get deformed easily
Tyler T on Jan 22, 2022
Extra parts
Susanne F on Jan 10, 2022
Good to have spare
GEORGE K on Jan 6, 2022
To have an extra on hand
D S on Dec 7, 2021
Always good to have spares.
Aaron L on Nov 22, 2021
Need 1 more
William B L on Nov 10, 2021
Spare part
Harold F on Nov 9, 2021
John K. on Oct 8, 2021
Just in case the original o-ring fails.
Christopher D on Aug 17, 2021
Current one is stretched out
Taylor N on Aug 11, 2021
Designed specifically to be used with a FermMonster carboy lid
Raymond Maiden on Aug 4, 2021
For above lid
Cary I on Aug 2, 2021
backup part
nathan p on Jul 28, 2021
Just in case. For the future.
Adrian O on Jul 23, 2021
Gotta have it for the lid to work
Jeff S on Jul 22, 2021
safety redundancy
Greg B on Jul 22, 2021
Just in case.
Craig C on Jul 6, 2021
Old rings got stretchy and were no longer sealing
Daniel Tate on Jun 30, 2021
Good to have replacements
Gary N on Jun 11, 2021
Dirk L Pletcher on Jun 5, 2021
Its been over a year since I last replaced the o-ring
David T on Jun 2, 2021
Michael W H on May 15, 2021
Spares are important
Shawn M on Apr 23, 2021
FRANK M on Apr 22, 2021
for backup
Joel T on Apr 19, 2021
Just in case I damaged one I would have a replacement.
Joel Bornhoft on Apr 19, 2021
Eventually I might damage one .
James Duclos on Mar 31, 2021
My O ring is no longer able to form a good seal
Patrick C on Mar 31, 2021
Tom F on Mar 29, 2021
For backup parts
Todd F on Mar 25, 2021
Always good to have some spares
Dave A on Mar 24, 2021
Replacement parts
Nicholas G on Mar 9, 2021
I don't want to be without this when I wear out the o-ring that comes with the Fermonster.
Matt Burns on Feb 9, 2021
TomR on Feb 8, 2021
For new lids
Wayne S on Jan 30, 2021
Trauma Nurse on Jan 8, 2021
Customer service recommended
Richard B on Dec 23, 2020
always like to have a spare
Patrick M on Dec 23, 2020
Wanted to have some replacements on hand. I like the fermonster carboys but the sealing o ring is pretty small and delicate.
Ryan H on Nov 25, 2020
Good idea
bruce b on Oct 25, 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
I need it
Tim Y on May 6, 2022
o-rings break
lawrence a b on Mar 10, 2022
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.

4.3 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Rated 1 out of 5
Lid and o-ring
O-ring and lid create a poor fit.
January 12, 2022
7 months ago
Rated 5 out of 5
Always nice to have a spare.
December 13, 2021
8 months ago
Rated 5 out of 5
Necessary items.
These are a must have, if you want your airlock to work. I enjoy the bubbles.
June 9, 2021
1 year ago
Rated 5 out of 5
Fits correctly and seals well.
March 3, 2021
1 year ago
Rated 4 out of 5
Works great just expensive for what it is.
May 3, 2020
over 4 years ago
Rated 5 out of 5
I bought this for a spare at my age it is easy to lose or misplace things I use.
February 12, 2019
over 3 years ago
Rated 5 out of 5
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 3 years ago
Rated 4 out of 5
It takes a little mucking about to get the o ring in place but they do seal well.
June 26, 2018
over 4 years ago