No sealant needed, but a little silicon grease would be OK. Hand tighten
only, don't use a wrench or pliers. Always use a fresh o-ring.

Jim
On Nov 13, 2015 5:42 PM, "Stan Shapiro" <mail@stanshapiro.com> wrote:

> When you replace the coolant level sensor in the expansion tank, do you
> screw it in dry, or do you need to put some sealer on it?
>
>
>
> Thanks
>
> stan
>