I have to install a new instant hot. How do you undo the old connector [Number 2198677] (disconnect the two pipes)?
The fitting that you have listed is a screw together fitting. You would just unscrew the nut to take the fitting loose. If it does not have the threaded fittings then it is a john guess fitting and there will be a blue, white or red ring around the tubing. Push inward toward the fitting on the ring and pull out the hose at the same time.