Rigid pipes
Here are the exterior diameters of the different rigid pipe sizes commonly found in spas and hot tubs:
- 1 inch: 33 mm (available adapter to 32 mm)
- 1.5 inches: 48 mm (available adapter to 50 mm)
- 2 inches: 60 mm (available adapter to 63 mm)
- 2.5 inches: 73 mm