Thread size on hydraulic breather cap Bobcat 610?

I'm away from my machine but am trying to line up the parts I need to adapt an attachment. Can anyone check the thread size where the breather cap screws into the top of the hydraulic reservoirs) where you pour in hydraulic fluid). I'd be very grateful. You can give me the NPT size, the ID of the threaded opening in the case, the approximate OD of the part that screws in, or any variation. (FYI, I am planning to plumb in the case drain line from a hydraulic motor for a fan attachment.) Thanks.

Don't know the size but make sure you filter the oil before you dump it into the tank

Got my answer. 3/4 NPT.