Kubota Diverter Valve Fitting Size

[oldafretired]

Anyone know what is the correct size fitting that goes on the diverter valve on the stick of a Kubota KX057/U55 that let's you switch from a thumb to another attachment?

 

[Dataway]

I'm reaching way back here .... but I have the same questions for the diverter valve on a KX-040. I've never seen such a hard piece of info to find. In fact the Kubota parts catalogs don't even seem to show the diverter valve.