These replacement propellers are for the New Version (NV) DA-20s. Reviewing the owner's manual will give you the correct part number required for replacement.
DA-20 1-1/2 HP NV #30008
DA-20 2 HP NV #30008.2
DA-20 3 HP NV. #30008.3
If you have any questions or are looking for a different part please email us at sales@superiorfountainandpond.com