part 3660390 Sealing system Ø 20 Annovi Reverberi code 3660390 Details Annovi Reverberi number3660390 DescriptionSealing system Ø 20 ItalianSistema di tenuta Ø 20Qty per pump3 Also comes in KIT 42841 Water seal kit, Ø20 mm Fits these pumps Annovi Reverberi RTX 1 RTX 30.300 N