Missing Grommet for Depth Finder Through Hull

[theorifice]

I just noticed that the through hull hole for the depth finder is missing a grommet/seal. Is there a suitable replacement given the hole pattern?

 

[roscoe]

3M 4200

 

[theorifice]

It looks like it could be a YakAttack that disintegrated over time?

 

[Bondo]

It looks like it could be a YakAttack that disintegrated over time?

Ayuh,..... Welcome Aboard,..... I usually use 4200 caulking, 'n a mini clamshell fitting to hide it,....