Hello I was given this hot tub from a friend who got it when he bought his house it came with no paper work so we have no idea what kinda of tub it is any ideas?

one of the jets came apart and I either need to replace the whole thing or just the parts but I dont know where to search for a good replacement jet cause I dont know the brand? its also my wifes favorite jet so it needs to be fixed fast. the jet is 2-3/8 across without the deco ring on it if that helps

Also the valves that allow air into the jets mine are broke at the top and dont do anything I seem to have bubbles in the tub but its not a lot if I replace them would I see more or with them being broke are they as open as they are going to get?

Thanks
Brad