Versa L2 thread size?

[amps]

Hey guys, a friend is asking me to design a strainer for the input of his Vectra L2. I can't seem to find any details on the threads used. It almost looks like 2" BSP but I'm not sure. Does anyone know?

Thanks!

 

[amps]

Still haven't figured this out, it'd be awesome to hear from somebody from Ecotech.