The water supply tube from our old dishwasher is hard plastic. It's not flexible enough to meet the connector on the dishwasher. The fitting near the water supply shut off under the sink was smooth around the outside and we couldn't get it to budge with pliers.
We are trying to replace this hard tubing with a universal dishwasher connector but can't remove the old plastic. Afraid we will break something if we force it. Once we get the plastic off, how do we get the brass PEX fitting to match the universal?