Very common impeller in older spas. The horsepower ratings were a bit confusing as some areas use Brake Horsepower, and also North American uses 60Hz power to our 50Hz. Old pumps that were 2hp-2.5hp may be labelled 5HP. Check dimensions to compare. Pump label may have on it's metal tag 1.5kW. 

Dimensions:

• 115mm Diameter
• 15.5 Vane Width (Inner)
• 6 x Vanes
• May be marked "5HP" on suction throat

New impellers are normally black, and perform / measure the same but look different on the back, and have a small hex in the centre of the throat.

310-4180