This is a Discharge Tee (2 x 1 inch S) x (1 x 1.5 inch Spg). It is commonly used with, 1 inch rigid pipe and 1 inch flexible rigid pipe. This is mainly used to immediately divert the pressure from the top of the Whirlpool bath pump evenly between the left and right side of the bath jets.
Best to use a plumbing cleaner then pipe cement to assemble. Pipe work pushes inside this part.
Height: 75 mm
Outer Length: 96 mm
Depth / Diameter: 48 mm x 41 mmx 41 mm