I cant give you the part number but it is has 16mm x 1.5 threads.. I asked on here and was told the size, and it was verified with the dealer as well..
Im riding the fence on the fumoto vs a femco.. im posted a question recently asking about any experience with the valve opening accidently or if the hose clip (if used) has ever come off..
Good luck
Brian
BTW - the QwikValve.com seems to be about the only place to get the valves. They have their own website, but also are selling on Amazon and ebay. The pricing seems to be the same every place i look