part 2820760 O-ring Ø 53,7x1,78 Annovi Reverberi code 2820760 Details Annovi Reverberi number2820760 DescriptionO-ring Ø 53,7x1,78 ItalianGuarnizione OR Ø 53,7x1,78Qty per pump3 Also comes in KIT 42310 Water seal kit, Ø40 mm Fits these pumps Annovi Reverberi RTF 2 RTF 135.100 N APRTF 150.100 N AP