part 1383330 Piston Ø 20 Annovi Reverberi code 1383330 Details Annovi Reverberi number1383330 DescriptionPiston Ø 20 ItalianPistone Ø 20Qty per pump3 Also comes in KIT 46109 Plunger kit, Ø20 mm Fits these pumps Annovi Reverberi JK 1 JK 18.16 H N