volvo 850 vacuum line size end of intake manifold and PTC

[JimBee]

I have the kit for the top and trap to engine block. I'll use 5/8' fuel line hose for the second top nipple on the trap to PTC. I'm still driving the car so cautious about pulling the PTC or its hoses to measure due to possible breakage.

So, with necessary fittings and most hose connectors sourced, I think I've got most things covered and ordered.

I need to source one more hose sized for the vacuum nipple at the end of the intake manifold (near the power steering pump) all the way to the lower PTC nipple near the bottom of the turbo accordion hose.

Does anybody know what ID size hose will be the right fit for the two nipple connections of that line?