Power steering pipe size

[Yanayaya]

Hello,

I'm sat at work and I don't have my notes on me, does anyone know the ID of the power steering pipework that goes to the cooler on a Monaro?
I need to replace some fittings and I can't remember the size. I think it's like 10mm...maybe?

[stevieturbo]

Typical low pressure return on PAS is 10mm OD. ( metal ) or 10mm ID flexible