I don't know about those fittings. As for the impeller, no need to replace it. Make sure it can't come on and reach in through the inlet hole at the bottom of the pump basket chamber and see if you feel anything tangled in it. If you do you can use a hooked wire or something like that to pull the stuff out. Can't emphasize it enough to make sure it cannot come on from a timer or someone throwing a switch accidentally.
Al