Volvo Penta DPI DPH H Series H9 Duoprop SET P/N 22754009 DUO PROP PROPELLER DP-HDPI and DPH H9 Stainless Duo Prop propeller set. This is a genuine H9 size Duo prop set of propellers for the DPI and DPH Sterndrive. The large blade area provides maximum grip and better manoeuvrability This set comes complete with shock absorbing rubber bushing and galvanic isolation protection. If your existing set is badly pitted or pink, then it's time to consider changing your props to this new stainless design before they fail. If you are