NDS 117-6 Jumbo Valve Box Extension — 13 x 20 x 6.5 in

The NDS 117-6 Jumbo Valve Box Extension adds approximately 6 inches of usable height to 13 x 20 in NDS rectangular valve boxes, creating extra space for irrigation valves, backflow components, wire splices and shallow installations. Built for professional and utility use, the extension is engineered for durability and long-term outdoor exposure.

• Dimensions: 13 in x 20 in footprint; nominal height 6-1/2 in (adds ~6 in).
• Material: injection-molded structural foam polyolefin treated with UV stabilizers to resist discoloration and cracking.
• Reinforced design: structural ribs, thicker wall sections and overlapping cover seat for superior sidewall and load strength.
• Installation: stacks on NDS 13 x 20 valve bodies (for example, 117BC); cover and valve box sold separately — extension only.
• Hardware: includes a 3/8 in 304 stainless steel nut for bolt-down capability when securing covers or mounting hardware.
• Applications: ideal for irrigation control valves, meter pits, sewer cleanouts, wire splices and protecting equipment in shallow or retrofit installations.

Manufactured to professional standards, the 117-6 extension provides contractors a durable, UV-resistant option to gain extra depth without excavation. Verify compatibility with existing 13 x 20 NDS bodies before ordering and consult product literature for installation details and load ratings.