Kinda the big brother of the P-180. The 280 is for the 1″ threaded shaft, 8 or 9 HP briggs or Honda engines.  2 1/2″ in and 2″ out, capable of pumping 300 gpm. These have been used on 4″ dredges, or two of them on 5 and 6″ dredges. It’s complete and in good condition. Also has the compressor mount for a T-80 or KAC. New pump seal too. Shipping should run right about $25, except Alaska.