@Sharpe I remember you posting an IBC tote with a rubber sleeve and can’t remember what the end of the discussion is, but this is how you can thread pvc right to an IBC if you don’t want to cam lock it.
The threaded/concave portion of an IBC tote valve where you can thread on or camlock on are called a “buttress”. (Insert childish laughter here)
I haven’t seen anyone mention that in my time here, but here’s the standard fitting for adding an NPT coupling.
It’s called G-floor. It’s been great. It has handled sh, oil, gas, and other chem. spills without an issue. I got it at Wallyworld .com. Robot or human?