Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
Believe me, it was nothing.
Having been responsible for group buys for soccer referees and having 8000 dollars worth of equipment in my living room, dining room and kitchen, I know that the thanks first need to go to Federica Wohler for putting up with all this stuff all over the house and...
Home Depot and Lowe's sells saddle valves. Commonly used, not only for RO units, but for ice makers on refrigerators.
Just so we're clear, this is what I'm talking about:
If you use acrylic (or other plastic like polycarbonate), I would say that you want at least ¼ inch for the reasons you have pointed out. If you go with glass, you could get away with 1/8 inch, especially in a 55 that is only 12 inches wide (I think). By the way, glass is probably the cheaper...