Since this claims to be the largest sailing forum I am posting my list here also (it is on other forums). Information toward making the list more complete is constantly coming in - so check back often. (Sorry, they won't let me post the links to owners' email addresses or websites.)
All Ptfe valve is purchased directly from global manufacturers, each batch of PTFE has its own unique number. We never mix these batches together, all our PTFE tube extrusions contain only one batch. When the polymer is mixed and extruded the batch number is recorded on the extrusion details sheet, this extrusion run number is referenced on a label applied to the Ptfe valve tube once sintered .
Take your valves and your extrusions and shove them deep down your anus