spa nozzle

I’m trying to replace these old spa jet nozzle tips and a couple of them I can’t manage to remove. Two of them I was able to remove with some needle nose pliers. Can anyone help me with what brand these are so I can find the removal tool?

In an effort to troubleshoot my spa, I discovered one of the spa jet returns is missing the internal nozzle. Does anyone know where I can source this? It fits a 15mm socket almost perfectly. I am not sure what size this is. There is a small "3" on the side. Thank you in advance!