I love simple, eloquent solutions.
So I was designing a vacuum hold down table for the CNC. Actually there will be two of them. I am working on the vertical one. I got some vacuum ball valves from MP Power. Then came the plumbing. The table is HDPE plastic. Thought about routing a depression between vacuum pods and screwing on a boss. My experience with keeping bosses from leaking is not stellar. So I found a nylon tee with hose barbs. But the ball valve didn't fit. Needed a bushing. Enter a short length of 1/2" clear tubing. Press fit. Pretty snug. Should not leak. Eloquent!
I love it when a plan comes together, even on the fly.
Now to rout a counter bore on the back to make the vacuum ball valve flush with the front surface. Then drill and tap with 1/2" pipe tap. Cut some foam rubber washers out on the laser and screw in the fittings. Add hose lengths and done. Then on to the off/on ball valve for each zone and into a manifold and on to the vacuum pump.
More pictures soon.