Underground Tank Carat XL

The Carat XL rainwater underground tank has been specially developed for rainwater harvesting. It is available in sizes 8,500 and 10,000 l, vehicle or lorry-bearing (combined with Telescopic dome shaft with cast iron lid or TRUCK).

Optimal tank geometry and statics due to CAD product development – equals highest stability
Unique fitting accuracy of the components
Dome opening with stainless steel profile for precision fit and secure mounting
Consistent quality due to constant production monitoring
Vehicle or lorry-bearing (combined with Telescopic dome shaft with cast iron lid or TRUCK)
Groundwater stable up to the middle of the tank thanks to extremely stable construction
Can be expanded as required

Specification

Carat XL underground tank

Carat XL underground tank (8,500 and 10,000 litres) for rainwater harvesting.

Seamless made of high-quality polyethylene (PE-LLD) - 100 % recyclable - made of one piece.

Truck passable up to SLW 12.

Numerous connection options DN 100/150/200. Larger connection pipes up to DN 300 on request.

Dome opening with rotated stainless steel ring - patented - for extreme stability as well as highest fitting

accuracy and assembly safety.

Large entrance dome (360° rotatable) according to DIN 1989.

Access opening Ø 800/650 mm, H = 610 mm.

Sealed up to the top edge of the terrain in connection with telescopic dome shaft and profile seal.

Tank casing with round grain gravel (max. grain size 8/16). Note the details in our instructions.

Fabricate: GRAF Carat XL underground tank

Volume [l]	Length [mm]	Width [mm]	Height [mm]	Weight [kg]
8500	3500	2040	2695	380
10000	3520	2240	2895	455
13000	4000	2420	3075	600

Technical specification

Unique ref.Underground-Tank-Carat-XL
TypeObject (single object)
Date of publishing2026-03-19
Edition number1

Links

Designed inGermany
Manufactured inGermany

Classification

BIMobject CategoryEngineering & Infrastructure - Water

Region availability

Europe	Asia	North America	Africa	South America	Oceania
Åland Islands	Afghanistan	Anguilla	Algeria	Argentina	American Samoa
Albania	Armenia	Antigua and Barbuda	Angola	Bolivia	Australia
Andorra	Azerbaijan	Aruba	Benin	Brazil	Cook Islands
Austria	Bahrain	Barbados	Botswana	Chile	Federated States of Micronesia
Belarus	Bangladesh	Belize	Burkina Faso	Colombia	Fiji
Belgium	Bhutan	Bermuda	Burundi	Ecuador	French Polynesia
Bosnia and Herzegovina	British Indian Ocean Territory	British Virgin Islands	Cameroon	Falkland Islands (Islas Malvinas)	Guam
Bulgaria	Brunei	Canada	Cape Verde	French Guiana	Kiribati
Croatia	Cambodia	Caribbean Netherlands	Central African Republic	Guyana	Marshall Islands
Cyprus	China	Cayman Islands	Chad	Paraguay	Nauru
Czech Republic	Christmas Island	Collectivity of Saint Martin	Comoros	Peru	New Caledonia
Denmark	Cocos (Keeling) Islands	Costa Rica	Côte d'Ivoire	Suriname	New Zealand
Estonia	Georgia	Cuba	Democratic Republic of the Congo	Uruguay	Niue
Faroe Islands	Hong Kong	Curaçao	Djibouti	Venezuela	Norfolk Island
Finland	India	Dominica	Egypt		Northern Mariana Islands
France	Indonesia	Dominican Republic	Equatorial Guinea		Palau
Germany	Iran	El Salvador	Eritrea		Papua New Guinea
Gibraltar	Iraq	Greenland	Eswatini		Pitcairn Islands
Greece	Israel	Grenada	Ethiopia		Samoa
Guernsey	Japan	Guadeloupe	Gabon		Solomon Islands
Hungary	Jordan	Guatemala	Ghana		Timor-Leste
Iceland	Kazakhstan	Haiti	Guinea		Tokelau
Ireland	Kuwait	Honduras	Guinea-Bissau		Tonga
Isle of Man	Kyrgyzstan	Jamaica	Kenya		Tuvalu
Italy	Laos	Martinique	Lesotho		United States Minor Outlying Islands
Jersey	Lebanon	Mexico	Liberia		Vanuatu
Latvia	Macau	Montserrat	Libya		Wallis and Futuna
Liechtenstein	Malaysia	Nicaragua	Madagascar
Lithuania	Maldives	Panama	Malawi
Luxembourg	Mongolia	Puerto Rico	Mali
Malta	Myanmar (Burma)	Saint Kitts and Nevis	Mauritania
Moldova	Nepal	Saint Lucia	Mauritius
Monaco	North Korea	Saint Pierre and Miquelon	Mayotte
Montenegro	Oman	Saint Vincent and the Grenadines	Morocco
Netherlands	Pakistan	Saint-Barthélemy	Mozambique
North Macedonia	Palestine	Sint Maarten	Namibia
Norway	Philippines	The Bahamas	Niger
Poland	Qatar	Trinidad and Tobago	Nigeria
Portugal	Saudi Arabia	Turks and Caicos Islands	Republic of the Congo
Romania	Singapore	U.S. Virgin Islands	Reunion
Russia	South Korea	United States	Rwanda
San Marino	Sri Lanka		Saint Helena
Serbia	Syria		São Tomé and Príncipe
Slovakia	Taiwan		Senegal
Slovenia	Tajikistan		Seychelles
Spain	Thailand		Sierra Leone
Svalbard and Jan Mayen	Türkiye		Somalia
Sweden	Turkmenistan		South Africa
Switzerland	United Arab Emirates		South Sudan
Ukraine	Uzbekistan		Sudan
United Kingdom	Vietnam		Tanzania
Vatican City	Yemen		The Gambia
			Togo
			Tunisia
			Uganda
			Western Sahara
			Zambia
			Zimbabwe

Underground Tank Carat XL

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