Re: Mercury Mark 25 Prop Adaptor Home › Forum › Ask A Member › Mercury Mark 25 Prop Adaptor › Re: Mercury Mark 25 Prop Adaptor mercurymanReplies: 467Topics: 167 February 1, 2018 at 2:18 am #70487 Cheetahgod has run a ad for 13" pitch prop to fit Mark 25. The only 13" I see was for a Mark 30 but I think it will fit.