mayfair wasn't printed on the box, just on the tag that the pro shop put on it. I just didn't know if it was correlated to "Indmar" which, on the impeller maintenance article in the "how to" section, specified "Indmar" as the type of impeller. Also on that article it says that you are supposed to turn the impeller clockwise as you fit it in, however, the exisitng impeller was turning counter-clockwise so i put the new one in the same way as the old one, counter-clockwise... i hope thats right???