Brian, regarding the problems you had with either the lids being on too tight (tough to remove) or too loose (developer leaks), this was my solution:
I matched the male and female couplers such that I could screw the two together (heh, that sounds a bit nasty, doesn't it?) all the way, without any effort. This would technically make a poor seal, but that's ok, since that's what your after.
I then found a small rubber O-ring to place on the male coupler. It's this ring that makes the seal, not the actual ABS threads. You can screw these things together practically as tight as you want, and you'll still be able to unscrew them.
As with everything, YMMV. Works for me, however.
Cheers!
-klm.
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