part 66100351 Head ring Ø18 h.p. Interpump code 66100351 Details Interpump number66100351 DescriptionHead ring Ø18 h.p. ItalianANELLO DI TESTA D.18 HPQty per pump3 Fits these pumps Interpump 58 C2W series 3 C2W2011C2W2012C2W2013