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The diagram illustrates how common PVC casing well sizes fit into the ID of Geoprobe® sonic bits.

PVC Casing Sizing

PVC Type OD ID (avg)
2 in. SCH40 2.38 in. 2.05 in.
2 in SCH80 2.38 in. 1.91 in.
4 in. SCH40 4.50 in. 4.00 in.
4 in. SCH80 4.50 in. 3.79 in.
6 in. SCH40 3.79 in. 6.03 in.
6 in. SCH80 6.63 in. 5.71 in.
8 in. SCH40 8.63 in. 7.94 in.
8 in. SCH80 8.63 in. 7.57 in.

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