Akbornlady

Ok, I give up trying to add a picture so I'll just explain. My tub has been leaking so I took one side off and found water consistently leaking from the bottom of a gate valve. It is a one piece valve not the two piece with screws. The left side has a hose that goes into the valve, then there is the 2" valve, then an elbow that goes on the outside of the valve, then a smaller elbow goes into that, then that goes into a fitting with that is like a big screw joint. I'm assuming I need to cut the hose on the left then replace the gate and 2 elbows? What size fitting goes around the 2" gate fitting then what size fits into that piece? I already have the tools and glue and primer. Any help is appreciated!