Aqua Genie plug question

Pool company closed our pool last fall and we're re-opening it ourselves for the first time. They screwed a gizmo into the pipe at the bottom of the Aqua Genie. I removed that, and see that there is another pipe that looks like it has a cap screwed onto it. Am I supposed to remove this cap too? Unfortunately we weren't home during the closing so I couldn't see everything they did.
 
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