Volvo Penta 280, 290 DP Propeller Nut.
Generaly this nut is used on DP-A, DP-B, some 280 DP and 290 DP sterndrives.
It has 9 prongs around its edge.
Tool required to remove this nut is part number 885127.
The alternative inner nut type is part number 3851334. This has 3 prongs around its edge. The tool required for this nut is part number 873058.
If you need help sizing a correct size for your boat, please contact us first.