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- Step design built into side-wall around the perimeter provides resistance against deflection in buried position.
- Constructed of fire-retardant materials. Combination of chopped glass spray-up and hand lay-up of woven roving glass reinforcement.
- External ribs are molded into all sides for greater side-wall and vertical strength.
- Heavy-duty reinforced fiberglass construction, stress areas strengthened with nonhydroscopic laminated reinforcing materials.
- Smooth exterior surface for tamper resistance.
- Exterior color: Munsell #7GY3.29/1.5 Green.
- Gel-coated exterior for superior protection against UV radiation and corrosion resistance.