So, that dishwasher crapped out and it is time for a new one. Although we could use some old parts and pipe, we should likely go forward with more, newer parts that won't be potential problems.
In our case, we will cut the 1/2-inch od copper pipe, add a new compression fitting, hammer arrester and braided hose. However, we could have done something else like soldered on a 1/2-inch brass fitting for pex and gone than route too.
Since the original compression fitting lasted 35 years without leaking and the copper slammed frequently since it had no hammer arrester, the route we chose to go should do.
To start with, we turn the shut-off so it is off. Then, we can remove the old drain and feeder pipes to the old dishwasher, and finally, pull it out.
After that, we can prepare the new hose lines and drainage. We can do this with the dishwasher in front of its final position. Once we connect the drain lines and hose to the new dishwasher, we just need to make sure they run under the sink.
After that, we can connect the drain hose to the abs under the sink and get to work on the copper. Or, we could have done this prep work first. Other way, it comes to the same thing.
In our case, we added a compression fitting to the copper pipe and secured it. It should be tight, but, not real tight. We don't want to damage the old copper the copper will bulge slightly in time around the olive too.
To add the compression fitting, we place the nut over the pipe, followed by an olive. Then, we thread the male in, attach a a hammer arrester and finally the braided hose. The connections for the hammer arrester and hose are slightly tighter than hand tight, but significantly less than forcefull tight since the washers don't need that excessive force to create a water tight seal.
Dishwasher drain connection to sink:
Down the road, shall we ever want to look at connections underneath the dishwasher, we can remove the bottom cover and take a look around.