Flexibles hoses

Here are the exterior diameters of the different flexible pipe sizes commonly found in spas and hot tubs:

• 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)

You will also find flexible hoses in metric sizes, which are less common in the spa industry.