Promax Septic Tank 5000L

These ‘Single Stage’ Filtered Promax Septic Tanks are manufactured from polyethylene to meet the AS/NZS:1546 Standard for Septic Tanks.

Designed by geotechnical experts this heavy-duty ribbed tank has been designed and fully tested to withstand ground and water pressure at depth and is completely internally plumbed up to the outlets.

  • Very strong heavy-duty one-piece ribbed construction
  • Lightweightmeans savings on transport and installation costs
  • Polyethylene will not corrode or rot
  • 300mm modular manhole riser extensions available
  • Easy to install using 100mm inlet/outlets

Click here for Local NZ Councils Bylaws on Water Disposal Systems

$4,939.00 (incl. GST)

Code Description Capacity(L) Diameter(mm) Length(mm) Manhole Dia(mm) Outlets(mm)
PMXUT05000ST Promax Septic Tank 5000L 5000 1280 5000 600 1x100

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.