[Jared]

Getting leak free connections can be tricky, but it's possible. Make sure that you cut off the tubing perfectly square. If you've already used a piece of tube in a connector, cut an inch off so that you have a fresh piece to grip.

Also, remember to put on teflon tape. It's important to wrap tightly and in the same direction as the threads on the fitting so it doesn't come off as you tighten it. I've found that using dry tape on a dry fitting works better.

Try not to get the tape too close to the end of the fitting. Leave a thread or so at the end, so that your tape doesn't come loose in the fitting and clog up the tiny holes in your solenoid valve. It's a pain to take the valves apart.