Mine is an old 2213 with no "automatic" lid (neither priming)...
The lid as two diameters the o-ring has to sit at the very position
on the smaller where it touches the larger.

When you close by hand you feel when you are not simultaneous.
Perhaps your handle prevent you of feeling it.
I never did use grease but I had leaks once every 10 closings.
You should prevent the O-ring to roll when you close.

Philippe


"JazzyB!" jazzybjazzy DONTWANTANY @hotmail.com wrote in message
...
Well the lid can only be opened simultaneously. It opens by moving the
handle which doubles as a water primer and seal lock. I wasn't aware that
the o-ring (sealing ring) could go any higher than it already is? In the
interim I just bought an AquaClear so the tank can continue to be
filtered.
That said, I'm not giving up on this 2231 Eheim filter as I really believe
that Eheim's are great. I've had several that worked smoothly. I think
it's a very small problem. Like everyone seems to say, I think it's
something to do with the o-ring which I believe is just a slight problem
that can be rectified.
"Philippe Lemaire (remove oldies)" wrote in
message . be...
With a round one as you close it first at one side then at the other
you are more likely to leak...

Entering the lid vertically can avoid this !
Also putting the o-ring as high as possible with some torque
to maintain it high as you release it.

Philippe