service kit: water seals KIT 42329 Water seal kit, Ø18 mm Annovi Reverberi code 42329 In the kit Part numberDescriptionPosition 2281730Gasket15 961240O-ring17 2281620Gasket18 2281740Piston guide19 Fits these pumps Annovi Reverberi RHW 4 RHW 10.15 NRHW 13.12 NRHW 13.17 NRHW 15.15 N