2010 Pennsylvania Code
Title 23 - DOMESTIC RELATIONS
Chapter 33 - Dissolution of Marital Status
3333 - Res judicata and estoppel.

     § 3333.  Res judicata and estoppel.
        The validity of a divorce or annulment decree granted by a
     court having jurisdiction over the subject matter may not be
     questioned by a party who was subject to the personal
     jurisdiction of the court except by direct appeal provided or
     prescribed by law. A party who sought and obtained a decree,
     financed or agreed to its procurement, or accepted a property
     settlement, alimony pendente lite or alimony pursuant to the
     terms of the decree, or who remarries after the decree, or is
     guilty of laches, is barred from making a collateral attack upon
     the validity of the decree unless, by clear and convincing
     evidence, it is established that fraud by the other party
     prevented the making of a timely appeal from the divorce or
     annulment decree.