Hello all ! My first post here but I have been wandering for a while reading tips 
I'm in Quebec, Canada and the weather has been very nice lately.
We bought a new house last september with an inground pool.
Before closing it last fall, I noticed that some water was getting behind the liner making it float a little above the bottom. From what I had read in the forums, that can happen if the the surrounding soil if saturated with water and it's better to just keep a good water level to force it out.
So, long story short, the water did got away (although not totally) before freezing and there we are now in April with (yay!) an early spring.
There was a lot of water behind the liner now and I found out that the owner of the house "tried" to patch the liner that tore around a pipe fitting. That's from where the water was getting behind the liner (I hope). It was a messy job and after removing the (broken) face plate and the dangling patch, I removed the water behind the liner by pumping it back into the pool. All the wrinkles disappeared and the liner went back right where it belongs
Then, I cut a large round patch from spare liner and used PVC glue to cover the whole thing with at least 2 inches more diameter than the damaged area:

I covered the whole thing since I think it would be better than trying to fix the tear and just do like if it was a new liner: screw the face plate and then cut the liner with an x-acto like that (picture from a video, not mine):

However, while looking for the screw holes with my hand, I came across a bump in the way. Fortunately, I took pictures before and found out that there is a plastic tab on one side:

That's when I understood why the previous face plate was broken: the previous owner tried to screw the face plate but that tab was in the way and broke it.
That's also when I thought that I needed to ask experts what to do about that in here
I tried to look on Google images what model that fitting is but all I find are images of already mounted parts and ads. And also more ads and websites with ads with the same images.
Should I just cut the plastic tab in the way so the face plate fit? Or maybe I don't have the good parts ?
Yours truly,
O.
I'm in Quebec, Canada and the weather has been very nice lately.
We bought a new house last september with an inground pool.
Before closing it last fall, I noticed that some water was getting behind the liner making it float a little above the bottom. From what I had read in the forums, that can happen if the the surrounding soil if saturated with water and it's better to just keep a good water level to force it out.
So, long story short, the water did got away (although not totally) before freezing and there we are now in April with (yay!) an early spring.
There was a lot of water behind the liner now and I found out that the owner of the house "tried" to patch the liner that tore around a pipe fitting. That's from where the water was getting behind the liner (I hope). It was a messy job and after removing the (broken) face plate and the dangling patch, I removed the water behind the liner by pumping it back into the pool. All the wrinkles disappeared and the liner went back right where it belongs

Then, I cut a large round patch from spare liner and used PVC glue to cover the whole thing with at least 2 inches more diameter than the damaged area:

I covered the whole thing since I think it would be better than trying to fix the tear and just do like if it was a new liner: screw the face plate and then cut the liner with an x-acto like that (picture from a video, not mine):

However, while looking for the screw holes with my hand, I came across a bump in the way. Fortunately, I took pictures before and found out that there is a plastic tab on one side:

That's when I understood why the previous face plate was broken: the previous owner tried to screw the face plate but that tab was in the way and broke it.
That's also when I thought that I needed to ask experts what to do about that in here

I tried to look on Google images what model that fitting is but all I find are images of already mounted parts and ads. And also more ads and websites with ads with the same images.
Should I just cut the plastic tab in the way so the face plate fit? Or maybe I don't have the good parts ?
Yours truly,
O.