Tap/thread size to add 4mm fitting to direct port manifold

[5mall5nail5]

I have an Aquamist 6 cylinder direct port manifold. I should have checked earlier but I want to order some parts this morning. I am going to add a 7th jet to the manifold (on the end cap on my lathe) to feed a 0.3mm jet at the compressor housing of my turbo setup. I believe its an M5 thread yes? Does anyone know the pitch so I can order a tap set?

Thanks,
Jon