part 47040856 Piston Ø16 x 49 Interpump code 47040856 Details Interpump number47040856 DescriptionPiston Ø16 x 49 ItalianPISTONE D. 16 X 49 (928-9281)Qty per pump3 Fits these pumps Interpump 47 series 2 W928W929