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Graf Carat Graf Carat Underground Tank – Cesspool, Wastewater & Rainwater Storage 2700L–6500L

from £853.12

The Graf Carat Underground Tank is a versatile below‑ground storage solution designed for wastewater, greywater, and rainwater. Ideal for properties without a mains sewer connection, it’s lightweight, easy to install, and available in capacities from 2,700 L to 6,500 L

  • Can be installed in groundwater

  • Shallow installation

  • Lightweight design for easy installation

  • Dual function the tank can also be used as a rainwater collection tank after cleaning

  • Self-anchoring (only Carat S)

  • Option for Pedestrian Lid or Heavy Duty Lid - vehicle loading up to 3.5t with a maxi tank dome (DN100 connection), composite plastic telescopic lid.

  • Option for high level alarm with audio and visual warning to alert that cesspool is full (see accessories)

Cesspools should only be emptied by a registered Waste Carrier and hold a current discharge licence from the local water authority. We can assist with this. Please call the office for more details. If unsure - give our friendly team a call.

Lid:
Size:

The Graf Carat Underground Tank is a versatile below‑ground storage solution designed for wastewater, greywater, and rainwater. Ideal for properties without a mains sewer connection, it’s lightweight, easy to install, and available in capacities from 2,700 L to 6,500 L

  • Can be installed in groundwater

  • Shallow installation

  • Lightweight design for easy installation

  • Dual function the tank can also be used as a rainwater collection tank after cleaning

  • Self-anchoring (only Carat S)

  • Option for Pedestrian Lid or Heavy Duty Lid - vehicle loading up to 3.5t with a maxi tank dome (DN100 connection), composite plastic telescopic lid.

  • Option for high level alarm with audio and visual warning to alert that cesspool is full (see accessories)

Cesspools should only be emptied by a registered Waste Carrier and hold a current discharge licence from the local water authority. We can assist with this. Please call the office for more details. If unsure - give our friendly team a call.

Graf High Level Alarm
Graf High Level Alarm
£273.00

Product Specifications

Size: 2700L

Length (mm): 2080

Width (mm): 1565

Height (mm): 1400

Weight (kg): 120

15 Year Warranty

Size: 3750L

Length (mm): 2080

Width (mm): 1755

Height (mm): 1590

Weight (kg): 150

15 Year Warranty

Size: 4800L

Length (mm): 2280

Width (mm): 1985

Height (mm): 1820

Weight (kg): 185

15 Year Warranty

Size: 6500L

Length (mm): 2390

Width (mm): 2190

Height (mm): 2100

Weight (kg): 220

15 year Warranty

Installation Manual

Delivery & Returns

  • Free delivery for England, Wales, and most of mainland Scotland. Additional charges may apply for the Scottish Highlands, Scottish Islands, Northern Ireland, Isle of Man, Channel Islands, or other remote locations, confirmed before order confirmation or dispatch.

  • Most orders are fulfilled within 10 working days from payment. Larger or specialist items may take longer — please contact us if your order is time-critical.

  • Offloading is the customer’s responsibility. Suitable equipment should be available to safely remove goods from the delivery vehicle.

  • For full delivery details, see our Delivery Policy.

  • Returns & Refunds: Standard items can be returned within 14 days of receipt, subject to our Returns & Refunds Policy. Many products are bespoke or custom-made (modified dimensions, fittings, pumps, colours, etc.) and cannot be returned unless faulty.