This fitting has the following designation, for example: 50/63 x 40 mm.

This means that you can insert a 50 mm pipe into the 50 mm dimension.
The 63 mm dimension means that you can glue a socket/elbow etc. onto it.
On the second side, a 40 mm pipe would fit into the 40 mm dimension.

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Inner/outer x reduction

(d) Inner diameter left	(d1) Outer diameter left	(d2) Inner diameter right	(E) Outer diameter right	L	L1	L2	Z	Weight
32 mm	40 mm	25 mm	33 mm	22 mm	24 mm	19 mm	30 mm	28 g
40 mm	50 mm	25 mm	33 mm	28 mm	31 mm	19 mm	40 mm	49 g
40 mm	50 mm	32 mm	41 mm	28 mm	31 mm	22 mm	37 mm	53 g
50 mm	63 mm	32 mm	41 mm	31 mm	38 mm	22 mm	43 mm	88g
50 mm	63 mm	40 mm	50 mm	32 mm	38 mm	26 mm	44 mm	93 g
63 mm	75 mm	40 mm	50 mm	38 mm	44 mm	26 mm	56 mm	124 g
63 mm	75 mm	50 mm	60 mm	38 mm	44 mm	32 mm	50 mm	130 g
75 mm	90 mm	50 mm	60.5 mm	44 mm	51	31 mm	61.5 mm	203 g
75 mm	90 mm	63 mm	75 mm	44 mm	51 mm	38 mm	55.1 mm	225 g
90 mm	110 mm	50 mm	60.5 mm	51 mm	61 mm	31 mm	79 mm	362 g
90 mm	110 mm	63 mm	75 mm	51 mm	61 mm	38 mm	72.5 mm	375 g
90 mm	110 mm	75 mm	88 mm	51 mm	61 mm	44 mm	66.7 mm	396 g
110 mm	125 mm	63 mm	75 mm	61 mm	69 mm	38 mm	88.5 mm	393 g
110 mm	125 mm	75 mm	88 mm	61 mm	69 mm	44 mm	83.8 mm	432 g
110 mm	125 mm	90 mm	106 mm	61 mm	69 mm	51 mm	78 mm	486 g