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The NDS 114-6 is a professional-grade valve box body extension designed to increase the depth of an existing valve box installation. It provides an additional 6 inches of depth to accommodate irrigation valves, ball valves, or other underground components that require more clearance than a standard box allows. The extension measures 14 inches long by 19 inches wide by 6 inches tall with an 11 x 17 inch interior opening. Irrigation contractors and plumbing professionals install this component when soil depth, valve sizing, or code requirements call for a deeper enclosure than the base unit provides.
This extension is suited for residential and light commercial irrigation systems, underground valve manifolds, and outdoor plumbing access points. It stacks onto a compatible base valve box to extend the overall depth of the assembly, making it practical in applications where valve handles, wiring, or backflow components need additional vertical clearance below grade. It is commonly installed during new irrigation system builds or retrofit work on existing systems where the original box is too shallow.
Designed as an OEM-style extension for professional valve box systems with an 11 x 17 inch opening footprint. Consult NDS documentation to confirm fitment with a specific base box model before ordering.
Irrigation contractors or licensed plumbers typically install valve box extensions as part of below-grade irrigation or outdoor plumbing rough-in work. Shut off the water supply and relieve system pressure before opening any existing valve box assembly. Ensure the extension seats flush and level on the base box to maintain proper lid fit and soil load distribution. Follow all local codes governing underground irrigation and plumbing access enclosures.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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