I believe this is a Hayward SP1070 Skimmer, but I can't find any online diagram that has this thing in it. It seems to be affixed pretty good-maybe that pin in the top? And can't get it to unscrew....? It doesn't look like any part of a Float Valve...is it?
Further, we're pretty sure the Main Drain is clogged. The hose is connected to the suction line and we think the other goes to the Main and doesn't seem to be connected to an Equalizer Line-not sure tho...
Yet, what is this other thing and what is it used for??