An N.D.S. Pro Standard valve box houses a drip control zone kit set over a minimum two-inch depth of drain gravel and topsoil. The assembly incorporates a PVC Schedule 40 mainline, Schedule 40 PVC tee or ell, Schedule 80 unions, Schedule 80 nipples, ball valves, and Schedule 40 solvent weld socket 90-degree elbows. Three-meter dry space connectors and expansion coils with a twenty-four-inch loop of excess wire connect the control wiring, which is taped to the underside of the mainline. The entire installation maintains an eighteen-inch minimum depth to the mainline with topsoil depth varying to finish grade.
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