service kit: water seals KIT 42159 Water seal kit, Ø20 mm Annovi Reverberi code 42159 In the kit Part numberDescriptionPosition 2820400Sealing system15 2820460Gasket18 2820480O-ring21 2820430Sealing system58 Fits these pumps Annovi Reverberi RTP 3 RTP 30.500 N APRTP 30.600 N APRTP 38.500 N AP