The gaskets all appear to be fine. No tears and they're in place where they should be. I tried putting petroleum jelly on the D-ring and filled and sealed the filter in my sink before moving it to the tank. But it's still sucking air.
Did I just get a bad filter? I don't know what else I can do here.
Can anyone recommend a different filter that would work for me?
I'm looking at the Ehiem Classic Canister filters and I think that might work but I can't tell from the pictures online whether I would have a similar problem with the outlet. Does anyone have experience with that model and know if it would work for me?