In-Ground First Flush Water Diverter Kit 300mm 
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In-Ground First Flush Water Diverter Kit 300mm



Description Code
In-Ground First Flush
Water Diverter
300mm In-Ground(Inlet fits 90mm pipe or 100mm female fitting) WDIG01
(300mm DIAM. PIPE)
Length Volume (L)
contained (approx.)
1.0 77 Plus (add) the volume of water held in the pipe section downstream of the Diverter, between the Chamber and the Flow Control Valve/Outlet. For every 1m of 100mm PVC pipe add 8L.
1.5 112
2.0 147
2.5 182
3.0 218
3.5 253
4.0 289
4.5 324
5.0 360
5.5 395
6.0 430

Compliance: Australian Standard AS/NZS 4020:2005 (Testing of products for use in contact with drinking water)

Buried and out of sight, In-Ground Water Diverters are perfect for sloping allotments. On a site that provides the opportunity for the end cap of the  diverter to be positioned above ground (to drain out and be accessible for maintenance), an In-Ground Diverter allows a ‘wet’ system to be converted into a ‘dry’ system.

Most systems are ‘wet’ due to the size of buildings, and the placement of tanks away from the buildings mean that there are long runs of pipe underground leading to a riser at the tank. On a sloping site this diverter ensures the diverted water and the water that would normally remain in the pipes empties out. The result – a ‘dry’ system that improves water quality.

Features and Benefits

  • Prevents sediment, bird droppings, spiders, insects, mosquito eggs and debris from entering the rainwater tank.
  • Improves water quality, protects pumps and internal appliances.
  • Ideal to use in conjunction with a rain head.
  • Perfect for sloping allotments.
  • No mechanical parts.
  • Inlet fits 90mm pipe or 100mm female fitting.
  • Simple to install – just add pipe and glue.
  • Low maintenance.
  • Converts a ‘wet’ system in to a ‘dry’ system.




How much water to divert

It is important to prevent heavy sediments and other roof pollutants from entering the rainwater tank. The amount of water diverted should be a minimum of 20 litres per 100 square metres of roof area (or 0.2L per m2). In calculating the amount of water to divert, consideration can be given to (1) the surface area of the roof, and (2) theamount of pollutants on the roof and gutters.

The following factors can be used as a guide in determining the volume of water to be diverted.

As a rule of thumb, the more water that is diverted the better the quality of water in the tank.


Multi pipe feed systems

These water diverters can handle more than one pipe

Single or multiple pipes carrying water from the roof can be directed into an In-Ground Water Diverter.


Installation Instructions

Determine the length of 300mm pipe required using the table.
Inlet End: The ball seat #6 is inserted into the top of the end cap as shown.
– For 90mm infeed – insert the ball seat #6 and attach the infeed pipe
hard down on top of ball seat #6.
– For 100mm infeed – insert the ball seat #6 and glue the 90mm keeper
ring (28mm long) hard down on top of the ball seat #6 to keep it firmly
in place.
Outlet End: The outlet requires only 90mm pipe. Assemble as shown in the attached drawing making sure to insert ball #7 before attaching cap #11. Select one of the four control valves #12 and fit into hose connector #13. Save the remaining valves for possible later use.

in ground diverter install image


Code: WDIG01
Price (each): $185.00

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