Yes PHC mouthpieces DO fit American horns.

Posted by PHC on December 21, 1999:
Yes the PHC range of mouthpieces DO fit all leading American horns as well as London's Paxman instruments.
PHC mouthpieces are made with a standard "Morse #0" taper which is used in the USA.
Some German makers use a different taper which is why the 'European' label is used in some specification lists.
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