Modeling Pipes

Hello Patrick. There can be a couple of things going on here. Can you add screenshots? Even better a screen grab video if you can. Also can you point to a time stamp in the video to see what Kent is doing and can get a better idea.

Hi Patrick ppatthevisionary

Also make sure that both circles are part of the same Object; you can go/be into Edit Mode on two Objects at the same time, but you can't 'connect' them in any way (like Bridge Edge Loops).

It really looks like those are 2 seperate Objects:

(The icons on the left indicate that both Objects are in Edit Mode)

In Object Mode, Select both and CTRL+J to make them into one Object.

I couldn't help but notice your columns, they have a problem somewhere, they look like they have some weird extrusion or rogue vertices, unless that's by design?