Ikelite Lens Extension Stuck In Precision Dome Port...problem?

I have a precision dome port (Ikelite) for my tokina 11-17 fisheye and as i was going to disassemble it for cleaning, I could not remove the modular lens extension tube from the dome port. What would you guys suggest?

Would it be dangerous (chance of flooding) if I were to leave it stuck in place without taking it apart to lube the o rings? I have no idea if I'm better off leaving it without risking damage to the dome port or trying to remove it with a rubber wrench. If there is no chance of it flooding as long as I dont mess with it I wont touch it. Please let me know if you have any suggestions!

-Joe

dont have the precision dome but the ikelite one. When it is stuck use the rubber wrench / strap wrench..No problem...

http://www.tradecounterdirect.com/add_icon.php?image=http://www.tradecounterdirect.com/custom/images/products/rolson-strap-wrench.jpg

the strap wrench worked perfectly, thank you! It wouldn't budge at first so I let the port soak in cold water for a few hours to shrink the plastic a bit and with some force it came off. Thanks again for the suggestion.