I just bought a bunch of these for my system, just because those hose clamps make me nervous. Plastic is generally my best friend.
http://www.usplastic.com/catalog/pro...ftube+Fittings
Contrary to popular opinion on quick release clamps, these fittings
do not restrict the flow in your tubes at all.
In fact, the ID is near the same as the tubes themselves. They accomplish this by slipping the tubing over a bulbous end and sliding a locking grip over it.
I have yet to find fault with these little buggers, and I highly reccomend them. Of course, I was using soft Tygon tubing and vinyl could be a bit harder to stretch over the bulb. I'll test it later tonight and reply to this thread.
I also noticed these after I ordered:
http://www.usplastic.com/catalog/pro...ion+Connectors
Coupled with these:
http://www.usplastic.com/catalog/pro...t+Tube+Inserts
These could also be a viable solution, although I can't vouch for the flow diameter. These fittings remind me of the typical Festo pneumatic fittings, and are very easy to use.