The 1.5 inch 45 elbow male-female is most commonly used with 1.5 inch rigid pipe and 1.5 inch flexible rigid pipe.
Best to use a plumbing cleaner then pipe cement to assemble. Pipework pushes inside this part at the female end. At the male end it pushes in to a female socket.
Internal Diameter: 39 mm (male end) 49 mm (female end)
Depth / Diameter: 48 (male end) 58 mm (female end)