How a PEX Plumbing Manifold Works. A PEX manifold includes separate manifold chambers to serve hot and cold water lines. The cold-water manifold is fed from the main water supply line, and the hot-water manifold is fed from the water heater. … A water line dedicated to each fixture originates from a port in the manifold.

Should you use a manifold with PEX?

Do I Have to Use Manifolds with PEX? No. You can install PEX fittings supply just like you would other pipe, with main lines and branches to each fixture. … But they actually simplify plumbing runs and reduce possible leaks by eliminating the need for tees and other fittings between the main supply line and the fixture.

Why do you need a PEX manifold?

A PEX plumbing manifold provides a plumbing hub for modern, residential plumbing systems that distributes water to various zones throughout the home. The PEX manifold serves as a convenient control mechanism for your homes plumbing system.