Unknown pipe after pump | Central Heating Forum | Plumbers Forums

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Hello does anyone know what this pipe is which diverges from the main pipe after the central heating pump. It seems to connect to the return pipe from the cylinder, so I guess it isn't a bypass?
20230205_191158.jpg
20230205_191149.jpg
 
Bypass not needed with a 3 port so you can close the valve fully
 

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