Is this an autofill valve?

Ig,

The little grid on the left is an overflow port..

The item on the right under the cover may be an autofill, but if it is, it is missing the guts that make it work.

Do you have a nearby hose bib on your house that has a pipe that has been attached with a pipe leading into the ground?

Thanks,

Jim R.
 
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You are missing any valve for those open pipes to be an auto fill.

If you put a shopvac on each pipe and blow air into it and see where bubbles come out in the pool or equipment pad.
 
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Do you have a nearby hose bib on your house that has a pipe that has been attached with a pipe leading into the ground?

Thanks,

Jim R.
Jim, that is not his house. It is a pool at a school. See…

 
Ig,

The little grid on the left is an overflow port..

The item on the right under the cover may be an autofill, but if it is, it is missing the guts that make it work.

Do you have a nearby hose bib on your house that has a pipe that has been attached with a pipe leading into the ground?

Thanks,

Jim R.
Hi!

This is for school. And I've volunteered to resuscitate the pool.

There are 2 big water lines on the property, running along fences. The pool is equally spaced between them.

I will have to look for water line branchings on each of them after I've finished SLAMing this pool.

Thank you! You gave me idea of the scope of this task. I'll have to relegate it to one of the last items on my ToDo list. 😁

Thank you very much!
Ig
 
You are missing any valve for those open pipes to be an auto fill.

If you put a shopvac on each pipe and blow air into it and see where bubbles come out in the pool or equipment pad.
Tall narrow pipe leads to the pool. I have actually tried to clean it with garden hose jet from pool-side and that's how that cavity got filled.

I'll check the other one as you suggested - I found shop vac in the maintenance storage. The school property is huge (bought in neglected condition), the staff is 4.

Thank you!
 
That looks like it may be a Pentair T40FB Autofill Automatic Water Filler with Fluidmaster Valve.

You are missing the Fluidmaster valve. Note that Fluidmaster valve is different then the Fluidmaster valve used in toilets.

The tall narrow pipe is the equalizer pipe. See the attached manual.

You have a plug in the hole where the FluidMaster valve would screw into the water supply.

 

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Here is what the autofill should look like with the Fluidmaster valve installed.

The top hole in the photo is the equalization line that goes to the pool. The bottom hole, or standpipe, is the overflow. The outlet comes out on the wall of the pool.


full
 
Here is what the autofill should look like with the Fluidmaster valve installed.

The top hole in the photo is the equalization line that goes to the pool. The bottom hole, or standpipe, is the overflow. The outlet comes out on the wall of the pool.
Hopefully, the OP's overflow pipe is removable, or a float valve assembly won't be able to be screwed in. But, if that wall overflow is functional, can't really see a need for the one in the can. Edit to add: Now that I look closer at the example you posted, how the heck did they screw that in without hitting the wall??
 
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Watch the video in post #7.
Oh, OK. Didn't know it disassembled from the top. But, I did just check my spare Fluidmaster, and seems you can also slide up a plastic compression ring at the base of top half and then pull up, and the whole float assembly half of unit comes off, leaving only the base stem threaded into the can.
 
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