These would be AA, the smaller of the common small pump series.

Brian

 

Thanks for responding. One other question, what is the shaft diameter and keyway size ? Want to order another complete coupling .

 

Reference material:
http://www.fluidynefp.com/LiteratureDoc.ashx?Id=140&Name=SAEMountandShaft

 

Thanks Ken. As long as they didnt do anything different and they are using the standard aa flange and shaft specs i can order a new coupling.
Thanks again.