C15 oil tank connections

[phill]

Hi,
       I am trying to sort out the connections to the rear of the oil tank (hopefully photo attached). I'm guessing the top one is a breather but where do the other 2 go - 1 large and 1 small. Can't find any info on this anywhere so please help if you can.

Phil

[JulianS]

See service sheet 603, below, from BSA service sheets

[phill]

That's great - thanks