This part is a 2" Slip X 2" Slip X (4) 3/4" Ports Manifold open style.
This part used in tubs where 3/4" soft pipe which measure 1" OD or 3/4" ID glues inside the ports and goes to the back of each jet in the tub and is plumb into 2" Pipe which measure 2 3/8" OD that runs from the pump pressure side.