If its not 1/8 I don't know what it would be. Go to the hardware store and spend $2 on a few different NPT fittings that look close untill you find the right one. Or I suppose you could just measure it.....
I called Phoenix Turbo just this week to order my T3/T4 and I asked them about restrictors. I was told that if you are using a -3AN line you don't need a restrictor. In addition, the guy said that they had recived a few turbos for rebuilding that had died from oil starvation using a restrictor on a larger line, like a -4AN.
Thats just what they said, I am no expert. So I am changing out my -4AN to a -3AN and calling it a day.
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