what does pa mean

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Parallel Arm
The 4041 Rw/PA and the Hw/PA have the same template.  The only difference is the arm. The 4041/4040XP Hw/PA, if mounted to the 180° template, will hold the door open at 180°. Rw/PA is Regular A...
The Rw/PA arm is simply a regular arm that is packed with a 62PA (parallel arm) shoe, which will allow a (Tri-Pack) closer to be mounted in a regular, top jamb, or parallel arm application.
The 4040 Rw/PA can be mounted 3 different ways. The 4040-18 drop plate is used for the regular pull side mount. The 4040-18TJ drop plate is used for the top jamb push side mount. The 4040-18P...
To install a 4041/4040XP with Rw/PA or Hw/PA arm, you need a minimum of 5-3/8" top rail on the door, measured from the bottom of the stop. If the top rail is less than 5-3/8", you will need to use ...