part 3660150 Piston Ø 25 Annovi Reverberi code 3660150 Details Annovi Reverberi number3660150 DescriptionPiston Ø 25 ItalianPistone Ø 25Qty per pump3 Also comes in KIT 42837 Plunger kit, Ø25 mm Fits these pumps Annovi Reverberi RTX 1 RTX 50.300