What Size Is This Plug

[EverydayDiesel]

I am trying to plug the one circled in green and I thought that the size was 24mm x 1.5 but that is way too big or a cummins part number?

I called the local cummins but they didnt have a clue

Does anyone know what size is circled in green

 

[Mark Nixon]

Actual diameter or pipe size?

I went out and looked at one on a head and I want to say 18 or 19 millimeter in diameter, but somehow I think it will be a pipe sizing.

Mark.

 

[EverydayDiesel]

thanks for the reply, I just want to plug the hole (actually thats been my lifes mission...)

 

[YoungDiesel27]

1/2" npt

 

[GOT-Torque]

it's just pipe thread. 1/2" npt sounds right