The average house has about 10 of the push-pull valves. These rarely need to be used. At the toilet, the only reason to close the valve is to replace the fill valve or the toilet itself. You can replace the gasket, chain, or fill hose by having someone hold the fill valve in the closed position without closing the push-pull valve. Another option is to shut off the main water valve, which probably should be tested periodically anyway. I don't think it makes sense to have a plumber replace all of the valves. Even if you do, there is no guarantee that new turn type valves will not leak. My opinion.
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