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 Underground tanks are vehicular traffic approved with the correct installation.

We recommend using a registered plumber or drainlayer to install your water tanks, however if you wish to install yourself the below guidelines will be useful.

Click here to download Promax Big Tank Installation Guide PDF.

Click here to download Underground Tank Installation Guide PDF

Click here to view an installation video of a Promax 30000L Water Tank