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Pipes and hoses

Most hot tubs are manufactured with pipework in imperial sizes, with names in inches. Note that the name of the pipe does not correspond to the actual size in inches! We know... it's confusing. Here are the exterior diameters of the different pipe sizes commonly found in spas and hot tubs:
  • 1/4 inch: 9 mm
  • 3/8 inch: 14 mm
  • 1/2 inch: 21 mm (available adapter to 20 mm)
  • 3/4 inch: 27 mm (available adapter to 25 mm)
  • 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