Choose quality and style with the Promax range of large corrugated tanks, designed for superior performance and peace of mind.


These ultra strong tanks are engineered to last and compliment every landscape with their contemporary look.


Promax tanks are so strong they are the only plastic water tanks in NZ that can be buried up to 1 metre in the ground and still retain a 20-year warranty!


Free delivery to your property


  • Corrugated side walls for extra strength
  • One piece construction - reducing maintenance and costs
  • Bury up to 1 metre in the ground - can help to overcome height restrictions
  • 4 inlet panels for ease of installation
  • 2 x 50mm threaded base outlets
  • Clean, fresh untainted storage for drinking and household use
  • Range of 7 Colours to suit your surroundings
  • 20-year warranty
  • Certification to AS/NZ 4766 - Polyethylene storage tank standard


  • Capacity: 25000L
    Diameter: 3660mm
    Height: 2800mm
    Weight: 387.6kg
    Manhole Diameter: 600mm
    Outlets: 2 x 50mm