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If you buy the same brand you should be able to just twist off the old one and then just twist on the new one if you don't want to change out the fitting on the sink.  It's pretty easy to do.  The discharge hose sure has a lot of fittings on it.  I prefer a solid hose run from the disposal to what should be the air gap and not direct to the dishwasher.  It's less likely to leak but it's not a big deal if you don't want to change that out.