How much vacuum can it take without damage?

All you have. It's thick and strong. I like it.

What is the inside diameter of the neck or what size rubber stopper fits the opening?

Inside diameter is 1.34 inches (34.22mm)

What size tubing does this require?

3/8 PE tubing works well and won't collapse. Get a 4" length of that, adapt it down to the much more flexible 1/4 PE tubing with a push connector. Run that to a push connect one way valve with it's arrow pointing to the pump. That way a malfunctioning pump can't back-feed pump oil into your project.

I see the package dimensions posted. What are the dimensions of the actual flask? Height and base diameter?

11in high with a 7in base diameter.

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