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”Shutter Box“ Series Grade Level Boxes (GLB®)

Unsurpassed “I-Beam” Strength


Inspired by the below-ground shutter boxes used for utilities throughout Europe, Channell’s “Shutter Box” Series GLB boxes
provide the highest-performance standards in the industry for thermoplastic subsurface enclosures.

One of the major features of the boxes is the straight sidewall “I-Beam” construction that, together with the high rib design, greatly increases the cover load bearing capacity and sidewall strength. Unlike standard thermoplastic tapered boxes, the “Shutter Box” straight sidewall design allows the cover load to be supported by the complete sidewall, rather than an unsupported “tapered neck.” This feature permits the “Shutter Box” Series boxes to be used for a multitude of greenbelt and sidewalk applications. With the additional option of a polymer concrete cover and ring, the boxes exhibit a static vertical load bearing capacity in excess of 25,000 pounds, making them suitable for driveway/alley applications.

A full range of unique options (patents pending) support this product, including a two-position swing-arm bracket, the universal L-Bolt™ locking feature and a Split Cover option with enclosure plug. Three sets of factory-installed threaded studs permit installation of optional hot-dipped galvanized racks and sidewall mounting brackets in the field. A pre-installed attachment plate permits the installation of a swing-arm equip- ment mounting plate, a Bracket Mounted Terminal (BMT®), or a fiber tap mounting plate
as required.

Designed to comply with the applicable elements of Western Underground Committee, ANSI / SCTE 77 2002 and Telcordia GR-902-CORE specifications.




  • Straight sidewall “I-beam” design permits higher load capacity
  • High rib design eliminates sidewall deflection in extreme soil conditions and firmly secures the box in the soil
  • High quality HDPE waffle-design of box body distributes load over strongest section of “Shutter Box” SGLB wall
  • Solid thermoplastic cover, or split cover with the optional two-way enclosure plug allows for quick, hassle-free “snap-in” pedestal upgrade
  • Universal “L” bolt security system eliminates the worry of lost cover bolts
  • Unique “T” style overlapping cover design prevents soil from interfering with cover removal
  • Two winterized drop/access holes are standard in the “Shutter Box” SGLB body
  • Cable locator marker can be quickly installed into cover
  • Optional “quick connect” polymer concrete covers and mounting rings available to upgrade “Shutter Box” SGLB for higher load bearing requirements when installing boxes in sidewalk or driveway applications
  • Three sets of factory-installed studs for field retrofit


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