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Resources: Class 150 vs 3000 Fittings - NPT Size Chart - Aluminum Info - Stainless Steel Info
| Sch-10 Pipe Size | Outside Diameter | Inside Diameter | Wall Thickness |
| 1-1/4" | 1.66" | 1.442" | 0.109" |
| Sch-40 Pipe Size | Outside Diameter | Inside Diameter | Wall Thickness |
| 1-1/4" | 1.66" | 1.380" | 0.140" |
