BTR Diff what size spanner?

[IainGriff]

Was hoping to change the diff oil this weekend, I've located what I assume to be the filler plug on the right hand side of the diff, looks to be quite a big size, can someone tell me what size spanner I need? I don't have one big enough for the job.

[EGB]

If its a BTR. I think it's a 29mm. A 30mm will do but a bit slack. I put a 1mm lip in my 30.

Edited by EGB on Friday 29th March 19:41

[IainGriff]

Thanks EGB
I will obtain a 29mm spanner and give it a go.
Regards
Iain