bulkhead

[reefme]

In your case the gasket on the dry side where your flange is.

[molotov]

Originally Posted by reefme

In your case the gasket on the dry side where your flange is.

gasket is on the dry side

[jagermaier]

Use aquarium safe silicone then tighten.

[molotov]

I was thinking of doing that. what if I siliconed around the outside on the dry side? Or would you remove the bulkhead, silicone the bulkhead where it meets the glass and tighten?

[jagermaier]

Remove the bulkhead, silicone where it meets the glass then tighten. Just make sure it is very dry before you silicone.