Screw on cap with grommet?

[Stormcrow]

I'm sick of messing with bungs on one gallon carboys. All my small carboys have threads on the top for the screw on caps that come with them, so I was thinking about buying extra caps, drilling a hole in the center, and fitting them with the proper sized grommet for an airlock.

I would prefer to just buy something like that, but haven't been able to find any besides a plastic version that gets a lot of bad reviews for cracking. Does anyone use caps like I'm describing, or know where I could order some? Or is this just something I need to DIY?
Thanks.

 

[verboten]

Like this? I have something similar for my 1 gallons.
https://www.amazon.com/DRILLED-AIRLOCK-FERMENTERS-GALLON-GLASS/dp/B01NBJQ2XI

 

[Stormcrow]

Like this? I have something similar for my 1 gallons.
https://www.amazon.com/DRILLED-AIRLOCK-FERMENTERS-GALLON-GLASS/dp/B01NBJQ2XI

Those are the ones I've seen. Have you had problems with them cracking?

 

[verboten]

I haven’t used them much, but no issues. They are all like 5 years old and not brittle.

 

[Stormcrow]

I haven’t used them much, but no issues. They are all like 5 years old and not brittle.

Good deal. Thanks