What is this thing in the skimmer?

It’s a diverter valve used by suction side cleaners so that the suction hose can plug into the skimmer and you adjust the amount of draw on the hose by turning the black knob.
 
It should be removed when not in use as there should be a basket in the skimmer to catch leaves and big stuff. You don’t want to suck lots of big debris into your plumbing as that can cause a suction side blockage.
 
They don’t typically screw in … it’s usually just a friction fit. You just pull up on it and it should pop out ….

@1poolman1 … is there anything special about this? Looks like the standard diverter that comes with all suction cleaners …
 
They don’t typically screw in … it’s usually just a friction fit. You just pull up on it and it should pop out ….

@1poolman1 … is there anything special about this? Looks like the standard diverter that comes with all suction cleaners …
Don't recognize that skimmer. A picture of the skimmer lid would help. It could be an internal diverter to adjust flow between skimmer and main drain. American Pool Products Admiral skimmers worked that way, the main drain hook-up was a horizontal port in the suction line below the skimmer bottom. It may just pull out.
 
What cleaner is this?

The liner wrinkles look like the type of wrinkles caused by low pH.

What is the TA and pH?

The skimmer looks like a Hayward skimmer.

The cleaner adaptor should pull out or unscrew.


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What cleaner is this?

The liner wrinkles look like the type of wrinkles caused by low pH.

What is the TA and pH?

The skimmer looks like a Hayward skimmer.

The cleaner adaptor should pull out or unscrew.


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View attachment 555809
It's a Zodiac MX8 as you suspected. I haven't had the home for long and the wrinkles were there when I got it. PH is currently a 7.7 and alkalinity is at 100, so hopefully we've stopped adding to the damage.
 
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Don't recognize that skimmer. A picture of the skimmer lid would help. It could be an internal diverter to adjust flow between skimmer and main drain. American Pool Products Admiral skimmers worked that way, the main drain hook-up was a horizontal port in the suction line below the skimmer bottom. It may just pull out.
Here is a photo of the lid.
 

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