What is this?

I found a port (without a cover) for when there apparently used to be a separate pump for my waterfall. I plumbed it to the main pump and now can use it as a second suction line.

I keep meaning to try to find a cover for it ... this is the first time I have actually seen it done. I need to find a similar one, ideally dark grey :whip:
 
I had my pool closed this week. I used the company that built the pool. It is a separate line from the returns and they said it is hooked to the main drain and when that gets plugged this line kicks in. Does this sound like something that is feasible? They also told me it is an exclusive design of theirs and that they are the company that came up with in floor cleaners design that all pool companies are using. I don't know if the are full of BS or not.
 

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