Rule #1: Whenever a new appliance is installed (refrig/dishwasher/washing machine) new water lines should be replaced and with dryers the cord should be replaced. No quality installer should install a new appliance without new accessories unless the lines are relatively new. Those that brag about hooking it up themselves with old lines are looking for leaks down the road that can be costly
Rule #2: The push/pull values are unique in that the water line is permanently connected to the valve. Therefore, in order to use new water lines (dishwasher washer or refrigerator) the valve must be replaced. If you have a push/pull valve no qualified installer would connect the existing lines, the push/pull valve must be replaced and that's when a licensed plumber is needed. Bottom line, if you already have a new valve, HD and Lowes etc will connect the new water line. If you have a push/pull valve a plumber must install a new valve first. I only wish the installers would explain to the customer why they cannot install an appliance instead of just walking out.
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