Quality Products

At Promax, quality is everything.

Promax is New Zealand’s premier manufacturer of superior polyethylene water storage and transport solutions. 

Our premium range includes corrugated Promax water storage tanks that are designed for optimum performance over many years. Meanwhile, our Xpress water tanks are made from high-grade polyethylene plastic and give you Promax quality at an affordable price. We have water tanks in all sizes, shapes, and applications.

We also have the accessories you’ll require, including pumps and covers, tank level indicators, fittings, fire coupling kits, leaf eaters and everything else you need to keep your rainwater storage safe, secure and clean. We’re leaders in drought protection and rain harvesting in New Zealand.

Promax also has one of the most versatile and highest-quality ranges of underground tanks in New Zealand. Our underground stormwater and underground wastewater tanks are designed for the effective retention or detention of stormwater or secure and reliable storage of potable water. 

We are proud to bring you the best-designed and manufactured colostrum tanks in New Zealand. Robust, secure and manufactured from food-grade polyethylene, our colostrum ranks are explicitly designed for the local dairy industry, and with the translucent polyethylene making it easy to monitor how much you have left in the tank. And, when it comes to septic tanks in New Zealand, there is no room for compromise. Hygiene and safety are paramount, and the structural integrity of the tank has to be flawless. That’s precisely what you get in every Promax septic tank. 

Visit our product  sections to learn more about the entire range of Promax products.

Our entire team is focused on combining exceptional design with manufacturing excellence to bring you a comprehensive range of products that look good and work even better. 

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. The Promax Underground Tank is engineered by geotechnical experts and Finite Element Analysis tested (FEA). Our Enduro tanks are so strong they are the only plastic water tanks in New Zealand that can be buried up to one metre and still retain a 20-year warranty! 

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.

You can also learn more about some of the projects Promax has proudly worked on here.