Geberit 380 Side Entry Inlet Valve. Note, this valve has a 3/8"BSP thread which is common for side inlet valves. It measures approximately 17mm diameter on the outside of the male thread.
Dimensions in pictures if you scroll through them:
Approximate dimensions as follows: Top of the Tee from end to end is 160mm. The height is 240mm and the width is 50mm max.
If you have a different fitting on this valve then you can swap them fairly easily. This video shows you how to do it:
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