Lambda boss size

[Agent47]

Looking to buy a boss for my new manifold, can anyone confirm the size? I'm 100 miles from my car and can't have a look. My guess is an M18

[dekerf1996]

Cant confirm the boss size, but when mine was knackered recently i purchased a M18 x 1.5 tap to fix the boss.

Worked a treat :-)

[Agent47]

Excellent. I'll get one of those.
Thanks