So I realized (with the help from you guys) that my skimmer SHOULD have a weir door, which it doesn't currently. I didn't know that all skimmer's should have a weir door until I was told so on here. Anyways, I looked under the skimmer lid and it is Pentair brand, so I'm assuming the weir door was a Pentair too. The only thing I see where the door should be is a tab sticking out on the middle top and a small rectangular shape hole on the bottom on each side. I'm assuming that the door will have a tab on each side that sticks into these holes, correct? In order to find the replacement door, all I need to do is measure the width and height of the inside where the door should be right? Or is there some number on the Pentair skimmer lid that may indicate what model door number I need?
Also,I forgot to mention, I did ask the previous owner what happened to the door and he said "it just kept coming off everytime I put it on". When I looked at the holes in the bottom, I noticed that it looked likethere was no space IN the hole for the tab to go into. There are rectangular holes cutout, but when I felt them it feels like the plaster is right up against the hole. Do you guys think that maybe it wasn't staying on bc the hole wasn't deep enough? Maybe whoever installed the pool didn't account for the holes to be there?