10mm x 1mm thread. Amazingly lovely and they work perfectly. Big Joe tested and guaranteed. No leaks, no worries. Three position: OFF, ON, RESERVE. This listing is for one pair.
I don't believe this style of 90-degree petcock ever came on Ducati, but they will work fine, particularly if you have a special application. All-metal construction except for filter and reserve standpipe, with plastic tank-to-petcock crush washers that work REALLY well!