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Imperial PVC pipe fittings are very confusing as the diameter refers to the inside diameter of the PVC pipe. This standard relates back to the age of steam in the early 19th century.
Below you will find a table which will help you to decide which pipe fitting you should buy.
|
Outside Diameter in mm's |
True Size | Action To Take |
|---|---|---|
| 20 mm | 20mm Metric |
Choose 20mm metric fittings |
| 21 mm | 1/2" Imperial | Choose fittings from list below |
| 25 mm | 25 mm metric | Choose 25mm Metric fittings |
| 26.5 mm | 3/4" imperial | Choose fittings from list below |
| 32 mm | 32 mm Metric | Choose 32mm Metric fittings |
| 33 mm | 1" Imperial | Choose fittings from list below |
| 40 mm | 40 mm metric | Choose 40mm Metric Fittings |
| 42 mm | 11/4" Imperial | Choose from fittings below |
| 47.5 mm | 11/2" Imperial | Choose from fittings below |
| 50 mm | 50 mm Metric | Choose 50mm Metric Fittings |
| 61 mm | 2" Imperial | Choose from fittings below |
| 63 mm | 63 mm Metric | Choose 63mm Metric fittings |
