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Pulsation plug - form "P"

What does "P" stand for in a 9013 product number

Product Line:
Limit Switches

US product

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

"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.

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