The P-Series user documentation refers to an AC Mains Filter (noise filter) as part number RFY-4010M. This particular filter may be difficult to source and is not an accessory that we intend on offering. Instead, here are some good alternatives:
Parker part number = NFI01/01 which is the TE Connectivity / Corcom model 12FC10 Single phase 120/240VAC 12 amps
Parker part number = NFI01/02 which is the TE Connectivity / Corcom model 16FCD10 3phase phase 240/480VAC 16 amps
The NFI models are available from Parker but not stocked. The Corcom models can be sourced from electronic supply houses such as Digikey, Mouser, or Newark.