I have a battery water alarm behind my refrigerator and under every sink and toilet. If there is water on the floor, it will sound an alarm. You can buy about 6 or 7 of them from Amazon for about $100. Not perfect, but cheap peace of mind. I think in today's world, plastic valves and supply lines are normal. And, paying a plumber to replace 10-12 valves and supply lines every 5 years would be very expensive.
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