Part identification.

[cmc0619]

Can anyone tell me what these plus looking things are? I have one one the floor midway of my pool and two near the drain/returns In the deepend.

 

[YippeeSkippy]

Most likely hydrostatic valves, that when the pool is ever emptied you open them to allow ground water up in to the pool. This helps prevent the pool popping upwards and out of the ground from the ground water pressure.

Maddie

 

[cmc0619]

Makes sense, thanks!