I agree with Cayennita: take the whole pump off when replacing the impeller. While the Jabsco impeller puller is not similar to using needle nosed pliers, I would have trouble paying something like $90 for a tool I might use once a year. If you take the pump off, put it in a vise, getting the old impeller out using 2 sets of pliers makes the job a bit easier, particularly if the pump faces aft like mine on a 2GM20F.