Citroen c5x7 squeaky noises while turning left

[GiveMeABreak]

Sorry - I was looking at (1) as that was highlighted in the diagram. Yes (3) is the low pressure pipe 4012P3, £40.14 from Citroen (UK Pricing), still available. Measurements are not provided.

[508c5]

thanks

would it be reasonable to assume 13MM ID (1/2 inch) ?

[GiveMeABreak]

Sorry can't advise on this, never had this pipe go on mine

[508c5]

apparently there is a tiny leak somewhere, can't figure out where from though

[508c5]

would it be OK to MIX a "stop leak" treatment (fluid) for power steering with our system's LDS fluid ? a pic for reference is attached