I'm new to pools and I just bought a house in fla. Learning how this works and have this pipe caped outside the cage. What could it be. An overflow but it looks too high? Not the light connection but the one next to it. Any help is determining what it is and how to use it would be great. Never know with the previous owner 85yr old woman that would cap a pipe if the overflow just ran but I have no idea. Awesome lady but stubborn. Thank you!