Brian,
I rejetted my hot tub a few months ago and they make a special wrench to fit into the "nubs" of the jet. I am no expert on this, but when I was trying to figure out what kind of jets to put back in my hot tub they all seemed to have their own wrench, so you may look at the jet and do an internet search to find a wrench to fit them....
Good Luck!!
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