What is this part

[Nikolabt]

I have noticed smoke coming out from underneath my bonnet I am concerned as it is not diesel leaking from injectors it is a part I'm bit unsure about anyone can help? 

Attached a photo if anyone can identify the part 

[Stevey Y]

7 hours ago, Nikolabt said:

I have noticed smoke coming out from underneath my bonnet I am concerned as it is not diesel leaking from injectors it is a part I'm bit unsure about anyone can help? 

Attached a photo if anyone can identify the part 

Hi thats the injector feed pipes, [the silver pipes] the black ones are rubber fuel return pipes these are prone to leaking with age, the other part coloured green is the cat with the oxygen sensor.

Steve.