service kit: water seals KIT 42402 Water seal kit, Ø22 mm Annovi Reverberi code 42402 In the kit Part numberDescriptionPosition 1942730Gasket14 1942940Piston guide15 820490O-ring16 1942860Water seal79 Fits these pumps Annovi Reverberi WHW 4 WHW 15.20 NWHW 21.15 NWHW 26.15 NWHW 32.20 N