If this were under the hood, I likely wouldn't care. But some of these connections are in the heater box. While not a PITA to pull, it isn't exactly fun just to fix a slipped hose. Plus, they sell these at Summit, I live near a Summit outlet and I have a Summit coupon right now that covers nearly half the price.

Oh, and it is easier to do a job right the first time than to do it over. Though the amount of time trying to find this tool nearly broke that rule.