Air tight PVC threads

Just use some Teflon tape, that should do it and you can still take it off when you want to.

"Hercules Pipe Dope" is about the best I think, its nice and thick, its a little more expensive at $5-6 a roll, but a roll will last you for years if your not a plumber.. .. ..It comes in a little flat can.

The trick with the tape is to not put too much on. It is actually not a 'sealant' but a lubricant for the threads. One or 2 times around the threads is all you need. One thing I've used on threaded pvc that worked very well was silicone. I just put a bit of it around the threads. ( I was out of pipe dope and was too lazy to run to the store.... ) It has worked for me pretty well the few times I've done it.

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afterall, a bad Oring was what made a space shuttle go down :O