Glue

[eleyan]

Thats what I've used (the blue one), no problems so far.

[Reef69]

Yep, used the same..no probs.

[NaCl_H2O]

I have been using "Oatey Rain R'Shine PVC Cement" lately. Use to use the clear stuff, but this is MUCH better. Seems to make a much better seal, and if the pipe is a little moist, this stuff doesn't care!