Walter R. wrote:
I removed a dysfunctional "Kitchen in the Closet" from the closet in my den.
It had hot/cold water, a washbasin, a refrigerator and a 4 burner stove. An
amazing fixture, but useless for me.

I cut off the plumbing drain, glued a cap on it and used the valves to turn
off the water. SNIP

Get a pair of "compression caps" for the valves; right now you are
relying on the rubber washers inside for prevention of a flood.
(I can't tell from the pic whether they are 3/8" or 1/2", but if
you still have the old supply tubing, take that along to the store.)

Jim