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It's 1/4" BSPT (British Standard Pipe Taper). I lot of people say it's 1/4" NPT, but it's not; they are very close. 1/4" BSP is 19 threads per inch and 1/4" is 18 threads per inch.
 

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I think it's 17mm. I usually just get the PCV hose from Nissan if I need one.
 

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Discussion Starter · #6 ·
I think it's 17mm. I usually just get the PCV hose from Nissan if I need one.
I have a new one, but I'm blocking off the pcv on the manifold to avoid pressurizing the crankcase through the valve not seating fully for my turbo setup

Running the pcv line pre turbo

17mm? Should be able to clamp a 3/4 down to that then. Thanks
 

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5/8" would be about 1mm smaller; it should stretch over it.
 
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