New Pool Owner With 2 Quick Questions

[NullQwerty]

Hi folks,

Just bought a house with an in-ground ground pool that I'm about to open for summer. I've been reading all about opening pools for 2 weeks, so I think I'm ready except for 2 problems.

1) I have 4 pipes that come out of the ground. One goes into the pump. Two come out of the filter. The third one just sits there 4 feet out of the ground and connects to nothing. It has a threaded cover at the end. I don't know what this pipe is or if there is anything I should do with it. Should I take off it's cover?

2) I have the Hayward EC-65 pump. Out of the pump comes what I can only describe as a pipe splitter. Two pipes connect to the splitter. My guess is one pipe is the waste line and the other pipe goes back into the pool with the filtered water. Looks like:
.........___<Pipe>
........|
------|
........|___<Pipe>
In between these 2 pipes is a lever. It has two settings. Port 1, and Port 2. I was expecting it however to say "Filter" & "Circulation" like most tutorials I read have described. So, if I am correct that the lever is intended to set it to Filter or Circulation, how do I know which is which? If I'm wrong, what should I know about this lever?

Thanks a ton!