part 2821910 Piston Ø 20 Annovi Reverberi code 2821910 Details Annovi Reverberi number2821910 DescriptionPiston Ø 20 ItalianPistone Ø 20Qty per pump3 Also comes in KIT 42157 Plunger kit, Ø20 mm Fits these pumps Annovi Reverberi RTP 3 RTP 30.500 N APRTP 30.600 N APRTP 38.500 N AP