Promax Underground Tank 1000L 0.9m dia

The Promax Underground Stormwater / Wastewater tanks are suitable for the retention or detention of stormwater or the storage of potable water.

The plastic detention  tanks are fully tested and designed to withstand ground and water pressure at depth.The Promax Underground tank is engineered by geotechnical experts and Finite Element Analysis tested (FEA).

Distinctive Benefits for:

  • Stormwater retention, detention and Wastewater storage
  • Large range from 1000 lt to 7000 lt with 0.9m diameter (larger on request)
  • Suitable to be installed under driveways, footpaths, car parks, forecourts and much more
  • Save time and money with multiple inlet/outlet plumbing ports
  • Vehicular Traffic - Tested to AS/NZS 2566:1-1998 with a load rating of 28kpa. 
  • Non Vehicular Traffic - Tanks in non-critical areas can be placed at any depth that is required
  • Certification to AS/NZ 4766 - Polyethylene storage tank standard

Click here to download full installation guide

NZ Regional Stormwater Management Requirements

NZ Councils Approved List of TP58 Writers

$1,416.00 (incl. GST)

Code Description Capacity(L) Diameter(mm) Length(mm) Weight(kg)
PMXUT01000.9DB Promax Underground Tank 1000L 0.9m dia 1000 900 1240 40

Promax Corrugated tanks are so tough you can bury them up to 1 metre in the ground - and they still retain their 20 year warranty!

Often a project can have height restrictions but also the need for a large amount of water storage - the Promax Corrugated big tanks are a perfect solution to this problem.


Promax Underground tanks are vehicular traffic approved - tested to AS/NZS 2566:1-1988 with a load rating of 28kpa. 

Click here to learn how to purchase Promax product online.