I apologize for my ignorance, but I don't know what a dedicated suction line or a suction side cleaner are! It might mean that I don't have either of them, but since I don't know what I'm looking for, I can't be sure.
I read that the 380 needs 30psi, and the 360 needs 19psi. Without both returns open, running normally, I have 17psi. (I think I read here that most of those gauges aren't accurate, though.) Does that mean anything about whether I can use the 380 or should sell it? I'm thinking that possibly when I close up one return, I'll have 34psi? Of course, this is a complete guess on my part, since I don't know anything about it.
About the different hoses and fittings: I was able to screw the Universal Wall Fitting into my return line after I removed the eyeball, but had difficulty getting the Quick Disconnect to stay in after I turned the pump on. Is this because the fittings are not meant for the return line, or because I didn't secure it properly?
Also, could you explain more about the "over the pool wall" kit? Where does it connect? What is a "pressure line" versus the regular return line? Is it something I could do myself, or would the PB have to do it?
Thank you so much for all your information!