I have a gas dryer which was converted to use propane. However, now my son has the dryer and his gas source is natural. How is the dryer converted back?

Marstyrum:::- The orrfice valve will have to be changed to one for (natural gas) Call the store where you got the dryer or a appliance store and repair, one of them will be able to fix you up , it's easy to change out good luck ;;;; F.B.E.