4bolt port thread size?

[julianf]

Ive got a 4 bolt PAS box here that im not going to use for a while. I want to blank off the ports and degrease the outside.

I dont have a set of spare pipes, else id just use them (and meaure the thread on them also)

Anyone know what the thread is on these? Standard disco / defender 300tdi fittment. (probably the same on the td5 also)

Thank you.