A one-half inch cold water line feeds the fixture through a one-half inch shut-off ball valve and union, transitioning to one-half inch outer diameter copper tubing. The tubing connects to a Precision Plumbing Products PO-500 trap primer, an AG-500 air gap fitting with a one-inch air gap, and a DU-3 or DU-4 distribution manifold located above the ceiling. One-half inch copper piping drops from the manifold through the wall cavity to serve floor drain traps below. Installation must follow manufacturer instructions, maintaining required height and routing within sheetrock walls or CMU block walls behind an approved access panel.
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