Dave, your post reminded me about a trick to getting tight connections where you unconnect and re-connect your tubing frequently. For example, at your check valve.
The basic premise is to use a new, small section of the tubing stretched over the old tubing. The elasticity and extra thickness prevent the tubing from stretching.
Take some new tubing and cut off a small section (approx. 1/4 inch max). You should now have something like a very short cylinder, almost like an O-ring. Get some needle nose pliers, and insert them into the cylinder, and pull the handles apart, to stretch the tubing piece (reverse of how you normally use pliers). Place this over your original tubing which connects to the check valve. It's a bit tricky, but well worth it.
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