part 2281740 Piston guide Ø 18 Annovi Reverberi code 2281740 Details Annovi Reverberi number2281740 DescriptionPiston guide Ø 18 ItalianGuida pistone posteriore Ø 18Qty per pump3 Also comes in KIT 42329 Water seal kit, Ø18 mm Fits these pumps Annovi Reverberi RHW 4 RHW 10.15 NRHW 13.12 NRHW 13.17 NRHW 15.15 N