Exhaust Test Port - Anyone know the size

[Tidybuoy]

If I wanted to cap off the exhaust test port, does anyone know the size cap and is this just brass?

[Techno Duck]

You can cap it with a spare lug nut.

[porsche4life]

I dropped a ball bearing in the hole... Then ran the fitting for the pipe down on that... The ball sealed it all shut...

[Tidybuoy]

Perfect.

I just checked and the lug nut is a perfect fit (and I just happen to have a few spares). I like the idea of putting a ball bearing into the hole too. I think both together will form a good seal.

I supposed there is some type of thread sealant for exhaust available and I will look for that next time I'm out & about.

Thanks.