50 mm (heater) | 32 mm (drain system)
50 mm hose is used for installing the heater to the hot tub. Approx. 1,5 metres of hose come with the heater set but you can buy more as an extra accessory if you need to place the heater a bit further away from the tub.
32 mm hose is to help to lead away the drain water. You can buy this hose as an accesssory.