100% NZ Custom Made Tanks

Marine tanks · Water tanks · Fuel tanks · Waste tanks

Hercules Tanks offers a complete design, construction and fitting service for all types of tanks, including:

  • Design and construction of tanks to fit any area and fully utilise all space
  • Fitting and plumbing of tanks
  • Baffled, clear of the bottom allowing for efficient drainage
  • Slide valves and hose for dumping
  • Fully warranted and professionally fitted
  • Tanks are pressure tested to CE Certified standards
  • Tanks thickness guaranteed
  • Tanks welded inside and outside
  • Tanks made in New Zealand


Hercules Tanks, United States Patent No. 9,359,133

Our Diesel & Petrol Fuel Tanks
are CE Certified and built to ISO 21487.
View our CE Certificate

Bespoke Virgin Plastic Tanks

High Density Polyethylene (HDPE) is used for all fuel tanks.  Using the thermoplastic polymer-formed method, we are able to easily cut, fold and weld all tanks inside and out, eliminating the number of joins needed to make a near seamless tank.  HDPE is lightweight yet super strong, very low moisture absorption, easily mouldable and resistant to corrosive chemicals and recyclable. 

Polypropylene (PP) is used for all types of water tanks.  PP is a food grade plastic material which will not taint fresh water and it does not allow odour absorption so ideal for waste/sewage water tanks.  Lightweight, super strong and recyclable.

Welding Rod: All our welding rod is made inhouse.  This enables use of the same HDPE or PP as the tank being manufactured.

Recyclable: All our High Density Polyethylene (HDPE) and Polypropylene (PP) plastic is sourced locally from PRO-FORM in Hamilton (a division of ARB New Zealand).  HDPE is fully recyclable using plastic code 2.   PP is fully recyclable using plastic code 5.  PRO-FORM practices lean manufacturing.   PRO-FORM takes back all processed offcuts to be used into their internal applications.  Each sheet of HDPE or PP is 95% virgin plastic and 5% recycled virgin plastic from our off cuts.