Quality Products

At Promax, quality is everything.

Not all poly tanks are made equal

Promax provides water tanks, liquid storage, and transport solutions to four sectors: Rural, Civil, Industrial, and Build. We combine exceptional design with manufacturing excellence to bring you a comprehensive range of products that look good and work even better.  


Promax rainwater tanks are engineered to the highest standards and manufactured with premium raw materials. We have invested in the most modern equipment available, and every aspect of the manufacturing process is controlled from start to finish. This ensures that our tanks are of the highest quality and will last for many years to come. Here are some of the things that make Promax the preferred choice for quality poly tanks:


Engineered to the highest standards: 
  • Our tanks are designed to withstand the harshest conditions, including extreme weather and high water pressure.
Manufactured with premium raw materials: 
  • We use only the best materials in our tanks, including fiberglass and resin. This ensures that our tanks are strong, durable, and resistant to corrosion.
Invested in the most modern equipment: 
  • We have invested in the latest equipment to ensure that our tanks are manufactured to the highest standards. This includes automated welding machines and computerized quality control systems.
Every aspect of the manufacturing process is controlled from start to finish: 
  • This ensures that our tanks are consistent in quality and meet our strict standards.


All Promax tanks are certified to AS/NZ 4766, and our detention tanks are fully tested and designed to withstand ground and water pressure, even at depth. Promax is also authorised to use the BSI registered Benchmark Product Certification Trademark on products identified in the Product Certification Schedule. You can view this here


Promax makes NZ’s best, most versatile and most durable range of water tanks so it’s no surprise that Promax is the preferred choice.