HPE

OFC’s HPE secondary seal is designed for high pressure
applications. The bottom compression plate is threaded and is
inserted in the bottom preparation of casing spools or tubing spools
with threaded preparations.

PE

OFC’s PE secondary seal is inserted in the bottom preparation of
a casing spool or tubing spool and retained with a snap wire. The
seal is energized when the spool is installed over the casing stub
and the flange connection is made up. Ending the sentence with
a preposition