Only fits the newer version valves, post 2008, with the two bolt flange, but (to make it really confusing) not the newer newer versions (2011 or so on) that use the conical PTFE gasket on the valve stem.
Knob thread: 15.7 O.D. x 1.5 mm (coarse) - valve thread: 19.8 O.D. x 1.2 mm (fine).
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.