Replacement Silicone Vacuum Hose Sizes, BKD

[Part-Timer]

Hi, I'm wanting to replace all vacuum hoses, and to order some silicone I would like to know what sizes are required? If anyone has done this any information would be much appreciated ?

 

[Audiforlife]

3mm and 5mm I. D springs to mind

 

[Part-Timer]

Is this 100%? Do you know about external diameter?

Thanks

 

[Part-Timer]

Do you know what the larger 5mm line is for?

I've noticed Darkside stating 4mm ID 8mm ED, Silicone Vacuum Hose ideal for Vacuum Lines, EGR Deletes, Breather Pipes, Wiring Insulation, Dump Valves, Boost Control Valves and General Engine Tidying