We want to pressure test the bottom drain of a concrete pool.
Which is the best idea to do this.The drain hole is on the side of the drain.

I think you may be confused. this is a message board. The owner does indeed check in, but this is not the company e-mail. The answer to your question is that Anderson makes a great kit to help you pressurize lines. And they have a nice DVD to help you see how to use. If you go to their main web page (home page), you can connect to their online store and there is a lot of helpful informatin. The equipment is not cheap, but it is a very good investment

You can either close the drain outlet port with an expanding plug or the whole thing with a very large expanding plug that will blow clear with very little pressure if you are not careful!
We will do both as the first proves the pipe and the second the connection of the pipe to the bottom drain.