I've never used an adapter plate to vacuum my pool. Actually today is the first time I've seen or heard of one. Anyway, does the plate fit to the bottom of the basket, or just wedge itself in the basket? dumb question, huh? The bottom of my basket is 6" and the smallest I find is 7 1/4. I don't know the make of my skimmer, but all other parts are Jandy.