Not chlorinating, never even heard of it before. What would I need to do that for if I may ask? There is just a single pipe going down inside the casing with two seals about 15' down and a brass check valve/jet then another smaller pipe extending about 30" below that, that screws into the bottom of the brass thing.
I'm not a well guy so maybe I have no idea what I have. I know the pump has some kind of adjustable thing off the side of it, that is cast iron with a long 1/4" threaded adjustment bolt/screw, kind of looks like a regulator. I know it's a 2" casing with just the one pipe down the well and a casting the pump mounts to with two large holes that match the bottom of the pump with a gasket between them and two threaded holes for the casting to mount to the pump. Then the casting/mount on top of the casing best I remember has a two bolt ring that slips over the outside of the casing and I think there is a rubber doughnut between the casing and ring that when you tighten the bolts, seals off the casing. It's been almost a year sense I last replaced them so not to sure if there is some kind of flange there, but I would think there has to be something to cause the two (casting and ring) to make a seal as you tighten the two bolts on the ring that slips over the outside of the casing.
I grabbed some pics off the net that best I remember is what I have, it is a Goulds pump and motor just as seen in the pic but don't remember there ever being the SJ on it. It was rebuilt and repainted so it could have been. The other pic is of whats on the single pipe hanging down inside the casing with the seals on it, then I think about 30" of slightly smaller pipe extending from it.
I am so feeling stupid at this point as I know nothing about what I have, only what I remember and replaced.