Grey water tank leak

[Eilatan]

My "new" rv's grey water tank has a leak. Found some posts where folks had to replace the 3" to 2" adapter and retro fit the plumbing back to the valve. It looks like it's leaking right where the adapter fits into the flange on the tank. There's some black silicone between the tank opening and adapter then a clamp. I tried tightening the clamp but it still leaks. Could it be that I just need to take out the adapter and put on some new silicone, or do I need to replace the adapter? Any ideas?

Thanks for any suggestions.

[Smithers]

I would remove the clamp and attempt to better identify the location of the leak.

If you do decide to add silicon or really anything else, you should remove what is there first and even sand down to get a scratch surface for the new sealant to grab onto. There are some products out there that will allow for application while wet, I had to run out to hardware store and do this to my fresh water a few years ago, sorry I don't recall the name but it was some sort of epoxy as I recall mixing it.

Lastly, in terms of those clamps, keep in mind that over tightening the clamp can cause a leak as well, those clamps can exert enough force to deform the piece you are clamping.