Those 2 pipes should slide apart, there is an "O" ring between them to keep it from leaking.Just twist the pan back and forth a bit and it should slide right off.
No sealer needed, just some sort of lubricant to help them slide back together.Cool! Thanks. I'll give it a shot.
BTW, when I reassemble it, do I need to do anything special to the O ring? Do I need to put an sort of sealant or something on? Or just slide it back together?