"cat rancher" wrote in message

Is there a cutoff or a plug for the quarter inch
tubing? I think the tubing is stiff from age but it's
been there about 6 years, too soon for oxidation,
if that's what you call it?

You mean plugging the tube at the original feed? Is there a saddle valve at
the main line? If so, just shut it off. Is the tubing copper or plastic?
If copper you can pinch the end and solder it closed. If it is plastic, I'd
not trust anything long term.

Or did you mean plugging the tubing on the fridge? If so, it is not
necessary to plug it as the water valve will keep it sealed.