part 2821710 Piston guide Ø 20 Annovi Reverberi code 2821710 Details Annovi Reverberi number2821710 DescriptionPiston guide Ø 20 ItalianGuida pistone anteriore Ø 20Qty per pump3 Also comes in KIT 42558 Plunger guide kit, Ø20 mm Fits these pumps Annovi Reverberi RTP 1 RTP 30.600 N AP