Most plumbing jobs I do require the water to be turned off for repairs. Most check valves in older homes are screw-in valves, and over time they all seem to freeze up. New 1/4 turn valves make it easy to replace old valves. I've recently replaced two and haven't had any leakage issues. I will definitely buy them again as they cost half the price of the ones I buy at the big hardware stores. Definitely a good buy!
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