Gearbox drain plug Allen key

[Fetta GTV]

Hi all
What size Allan key is needed for the gearbox drain plug.
Thanks
David

[colcol]

On my 33 it is 17mm, but it is external hex, and you need a 17mm ring spanner or socket.
I have seen some gearboxes that are internal hex.
I have used a bolt with a nut on it to undo an internal hex, as it was Sunday and Total Tools were not open, then on the Monday i have purchased a proper internal hex tool.
Just get under and have a look, Colin.

[Fetta GTV]

It's an internal hex.
Going to buy one and was after the size.
I'll try a few bolt heads in it and see what size it is

[ScottS]

12mm inhex