I have two similiar circulators with props that secure differently.
One prop mounts to the shaft with a screw through the center of the prop. If this is the case, Winnipesaukee Marine in Gilford sells them. I would also purchase a stainless steel screw. It will make removing it next time much easier.
The other has a set screw on the side of the prop. Watermark has this type.
In any event, remove the prop and take it with you.
Good luck.
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