Simple waterway jets, you can twist the jet counter clockwise and pull while twisting it should come out. Or you can twist it and use a butter knife behind the edge of the jet face and pry a bit. You can find many online sources for waterway jets. When you put the jet back in, on the back of the jet is a little square psc that needs to line up with the groove on the jet back (part in the spa the jet goes into) just push it in till it snaps. should rotate left and right a half turn or so each way.
