The Carat XXL underground tank has been specially developed for rainwater harvesting and for use as a retention cistern, firefighting water tank, process water tank and septic tank.

Available in the following versions

  • Flexibility and stability are perfectly combined
  • No need for heavy load transport on trucks up to the size of 76,000 ltrs
  • Secure investment thanks to the market leading 15-year warranty!
  • Lorry bearing up to 40 t
  • Groundwater-stable
  • Dome opening with stainless steel profile for precision fit and secure mounting
  • Lighter than equal tank made of concrete or steel
  • Numerous DN 100/150/200 connection surfaces
  • Optional DN 300 connection
  • Optional second tank dome
  • Up to 122,000 litres on request

Advantages

Thought-out in every detail

360° rotatable tank dome
360° rotatable tank dome
360° rotatable tank dome

Allows easy alignment to the connecting pipes. A tank that turns it`s head for you.

Low weight
Low weight
Low weight

Tank installation made easy! The significantly lower weight of GRAF products compared to steel or concrete cisterns makes transport and installation easier.

Groundwater stable
Groundwater stable
Groundwater stable

The tank can be partially or completely installed in groundwater. Please note the maximum immersion depths and necessary ground covers in the technical data.

Optionally with second tank dome
Optionally with second tank dome
Optionally with second tank dome

The GRAF XXL tank can optionally be equipped with a second tank dome.

Telescopic/Tiltable
Telescopic/Tiltable
Telescopic/Tiltable

The telescopic dome shafts are height-adjustable and can be tilted by 5 degrees. This makes it easy to adapt to the upper edge of the terrain.

Dome opening with stainless steel profile
Dome opening with stainless steel profile
Dome opening with stainless steel profile

Dome opening with stainless steel profile for high fitting accuracy and mounting safety.

Individual connections possible
Individual connections possible
Individual connections possible

Flexible connections possible according to customer requirements on the tank dome up to DN 300 or on the end face up to DN 300.

Free of remediation
Free of remediation
Free of remediation

Due to the constant contact with wastewater, concrete tanks are always at risk of corrosion. Depending on the degree of damage, this can result in expensive renovation of the tank. Plastic tanks are not at risk of corrosion due to their nature.

Vehicle-loading
Vehicle-loading
Vehicle-loading

Includes telescopic cast-iron dome shaft withvehicle-loading cover. This enables installation e.g. under the courtyard driveway.

360° rotatable tank dome

Allows easy alignment to the connecting pipes. A tank that turns it`s head for you.

Low weight

Tank installation made easy! The significantly lower weight of GRAF products compared to steel or concrete cisterns makes transport and installation easier.

Groundwater stable

The tank can be partially or completely installed in groundwater. Please note the maximum immersion depths and necessary ground covers in the technical data.

Optionally with second tank dome

The GRAF XXL tank can optionally be equipped with a second tank dome.

Telescopic/Tiltable

The telescopic dome shafts are height-adjustable and can be tilted by 5 degrees. This makes it easy to adapt to the upper edge of the terrain.

Dome opening with stainless steel profile

Dome opening with stainless steel profile for high fitting accuracy and mounting safety.

Individual connections possible

Flexible connections possible according to customer requirements on the tank dome up to DN 300 or on the end face up to DN 300.

Free of remediation

Due to the constant contact with wastewater, concrete tanks are always at risk of corrosion. Depending on the degree of damage, this can result in expensive renovation of the tank. Plastic tanks are not at risk of corrosion due to their nature.

Vehicle-loading

Includes telescopic cast-iron dome shaft withvehicle-loading cover. This enables installation e.g. under the courtyard driveway.

Sizing

Volume [l]Length [mm]Width [mm]Height [mm]Weight [kg]order no.add to enquiry
16000453025003160820380303
220006200250031601120380318
260007200250031601270380304
320008530250031601360380319
360009430250031601495380320
4200010915250031601705380321
4600011815250031601840380322
5200013300250031602050380323
5600014200250031602185380324
62000380314250031602395380325
6600016585250031602530380326
7200018070250031602740380327
7600018970250031602875380328
8200020455250031603085380345
8600021355250031603220380346
9200022840250031603430380347
9600023740250031603265380348
10200025225250031603775380349

calculated size Request for information

Technical details

Installation

max. earth covering [mm] (without groundwater, vehicle loading) 8

Groundwater installation

Earth covering with groundwater installation [mm] 800-2000

Downloads

Accessory