Does anyone know what This port is

MoDat

New member
Jun 5, 2020
3
Nj
hi guys,
IMG_0684.jpeg
So I have 2 jets in my shallow end that shoot water into the pool however, I have these 2 ports (1 in the middle of the pool and 1 by the spa) and neither one of the seem to function. Does any know what purpose they serve?