Fuel Hose

Edit again: I remember looking for the fuel hose for my 2018 Bonneville Speedmaster and couldn't find it on thany parts diagram so I ended up emailing Triumph to get the part number ([email protected]).

Edit: What I wrote below is bollocks, that tube and rollover valve is the tank breather...

I'd check the parts diagram that includes the petrol tank for your model of bike.
E.g. looking at this random one for example, there is a hose to a roll-over valve then a hose from that (presumably to the carbs). You obviously want the correct diagram - you didn't say what bike you had, I just put the part number you gave into Google and that seems to be for older carb bikes.

 

Yes, I realised I was talking rubbish about about that roll-over valve, that's in the tank breather. Glad you found the part.