I am trying to understand how my PB plumbed my skimmers. I specified separate plumbing for skimmers and main drain back to pad, which he did. But he also plumbed an equalizer line into the front skimmer fitting which goes into pool below skimmer. No eyeball or anything on it. And no flap or fitting in the skimmer side. He said it allows the skimmer to operate if the water drops below the skimmer mouth. I can see that. But if water level drops below the bottom of skimmer strainer then it will not do anything. So is it just a safeguard to not suck air for that few Inches of water? I read some web pages that said this is an old way to plumb it and not really used any more. The white pipe edge on the pool wall just looks unfinished. No reason it cannot get an eyeball, right?