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Home using a PEX manifold do not require an at fixture Supply Stop (shutoff) because fixtures can be shut off at the manifold. In this case, the bathroom sink has a dedicated supply on both the hot and cold manifolds. The water supply can be shut off to the bathroom sink at the manifolds without shutting off any other fixture. PEX is more flexible than PVC and copper. For this reason, you can run PEX directly to the fixture, without using