part 3720340 Piston Ø 12 Annovi Reverberi code 3720340 Details Annovi Reverberi number3720340 DescriptionPiston Ø 12 ItalianPistone Ø 12Qty per pump3 Also comes in KIT 42956 Plunger kit, Ø12 mm Fits these pumps Annovi Reverberi RQV 1 RQV 2.5 G30 D Annovi Reverberi RQW 1 RQW 2.5 G28 D