I think not. It should be duro 90 for tank pressure and a face seal.
EDIT: I take it back. You're right!
Will have to go take a feel of AP1409P and see if it feels like duro 70 or 90. It IS the same as the LP Port oring. My apologies.
A total aberration. For those reading along, if in the future @rsingler and I ever disagree about anything having to do with regulators, you should listen to him and ignore me.
In this case, it's only because I have several DS4s that I just serviced. In fact, one of them had an IP problem that I only addressed after @rsingler explained the fix.