H-20 Chambers The High Capacity H-20 and 3050 H-20 Chambers offer maximum internal volume per linear foot for high storage capacity at peak flows. They are ideal for commercial applications that may receive occasional traffic. The High Capacity H-20 Chamber The High Capacity H-20 Chamber gets an H-20 load rating with 18" of compacted cover when installed per installation requirements. See design details for live load traffic applications.

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