What does "P" stand for on a 9013 pressure switch?

Issue:
What is the form P on a 9013 pressure switch part number?

Product Line:
Class 9013 Pressure Switch

Environment:
US product

Cause:
Customer have found a unit without "P" form and are unsure if this will work

Resolution:
"P" denotes a pulsation plug that has been installed in the pressure line.  This plug prevents the switch from rapid cycling in situations when a pump has been installed in close proximity to the switch. The pulsation plug is a field installable option.

Released for: Schneider Electric Canada