400 litre Baffled Water Tank, Flat
Estimate delivery costs
Your postcode helps us show you accurate delivery costs before you add to basket. We use it only to calculate shipping rates — it is not stored or shared.
You may also need
-
1/2' RGO Brass Float Valve
£45.00 ex VAT
-
3/4' RGO Brass Float Valve
£46.00 ex VAT
Added to basket
Fit it out
These go with what you just added.
400 Litre Baffled Flat Water Tank
Product Overview
The 400 Litre Baffled Flat Water Tank is a robust and practical solution for the storage and transportation of potable water and a wide range of other compatible liquids.
Manufactured from durable MDPE / polyethylene, this low-profile rectangular tank provides a nominal capacity of 400 litres, equivalent to approximately 88 imperial gallons. Its flat design makes it particularly useful for applications where available height is restricted or where a large volume of water needs to be stored within a relatively compact footprint.
The tank incorporates an integrated baffling system designed to reduce the movement of water during transportation. The baffles are formed through grooves and openings that pass through the tank, helping to disrupt the movement of liquid and reduce side-to-side sloshing.
This makes the tank particularly suitable for mobile applications such as car valeting, window cleaning, mobile vehicle cleaning and other situations where water needs to be transported safely and efficiently.
The tank is manufactured in natural translucent medium-density polyethylene, allowing the approximate water level to be viewed through the tank wall.
With an empty weight of approximately 30 kg and dimensions of 1010 × 1250 × 360 mm, the tank provides substantial water storage capacity while maintaining a low overall height.
Key Features
- 400 litre nominal capacity
- Approx. 88 imperial gallons
- Low-profile flat rectangular design
- Integrated internal baffling system
- Manufactured from MDPE / polyethylene
- Suitable for potable water storage
- Suitable for a wide range of compatible liquids
- Natural translucent finish
- Approximate water level can be viewed through the tank
- Approx. 30 kg empty weight
- Dimensions of approximately 1010 × 1250 × 360 mm
- Standard 1" BSP outlet
- Large 8" lid
- Approx. 184 mm lid opening
- Baffles help reduce water movement during transportation
- Ideal for car valeting
- Suitable for window cleaning
- Suitable for mobile vehicle cleaning
- Suitable for liquid transportation
- Other colours available
- Suitable for above-ground applications
- Capacity subject to approximately ±3% manufacturing variation
Low-Profile, High-Capacity Design
The 400 Litre Baffled Flat Water Tank has been designed to provide a substantial water storage capacity while keeping the overall height relatively low.
Measuring approximately 1010 × 1250 mm across the base and 360 mm high, the tank provides 400 litres of nominal storage without requiring the height of a conventional upright tank.
This makes it particularly useful for vehicle-based installations, trailers, mobile equipment and other applications where vertical clearance may be limited.
The low-profile configuration can be particularly advantageous when installing a water tank beneath or alongside existing equipment.
Typical applications include:
- Car valeting
- Window cleaning
- Mobile vehicle cleaning
- Commercial cleaning
- Mobile pressure washing
- Potable water storage
- Agricultural applications
- Horticultural applications
- Irrigation
- Vehicle-based water systems
- Temporary water storage
- General-purpose liquid storage
The available installation space should be checked carefully before ordering to ensure that the tank dimensions and access requirements are suitable.
Integrated Baffle System
The tank incorporates an internal baffling system specifically designed to reduce water movement during transportation.
The baffles are formed by grooves and openings that run through the tank. These interrupt the movement of the liquid and help reduce side-to-side sloshing when the tank is transported with water inside.
This makes the tank particularly well suited to mobile applications where the tank may contain a substantial volume of water while a vehicle is in motion.
The baffled construction is particularly useful for:
- Car valeting
- Window cleaning
- Mobile vehicle cleaning
- Commercial cleaning
- Mobile pressure washing
- Vehicle-based water systems
- Liquid transportation
The baffles reduce water movement but do not eliminate it completely.
A full 400 litre tank contains approximately 400 kg of water, in addition to the weight of the tank itself. It is therefore essential that the tank is correctly installed and securely restrained before transportation.
Ideal for Car Valeting
The 400 litre capacity makes this tank particularly useful for professional car valeting and vehicle cleaning businesses that require a mobile water supply.
The flat configuration allows the tank to be installed in areas where a taller upright tank may not be practical, while the integrated baffles help reduce water movement during transportation.
The tank can be incorporated into a wider mobile cleaning system and connected to suitable pumps, hoses and pressure washing equipment.
The natural translucent construction also allows the operator to monitor the approximate remaining water level, making it easier to plan refilling during busy working periods.
Ideal for Window Cleaning
The tank is also well suited to professional window cleaning applications.
Its combination of 400 litre capacity, low-profile construction and internal baffling provides a practical solution for transporting a substantial quantity of water in a mobile cleaning vehicle.
The relatively low height can make it easier to install in vehicles where available vertical space is limited.
The tank can be connected to suitable pumps, hoses and other window cleaning equipment using compatible fittings and accessories.
Applications
The 400 Litre Baffled Flat Water Tank is particularly suitable for mobile and commercial water storage applications.
Typical applications include:
- Professional car valeting
- Window cleaning
- Mobile vehicle cleaning
- Mobile pressure washing
- Commercial cleaning
- Potable water storage
- Agricultural water storage
- Horticultural applications
- Irrigation systems
- Vehicle-based water systems
- Temporary water storage
- General-purpose liquid storage
The low-profile design makes the tank particularly useful where height is restricted, while the integrated baffling makes it suitable for transporting water when correctly installed and secured.
| Capacity | 400 litres |
|---|---|
| Dimensions (W×L×H) | 1010 × 1250 × 360 mm |
| Empty Weight | 30 kg |
| Material | MDPE |
Important — please read
Please ensure the product you are ordering is the correct size and suitable for the purpose. Special order, bespoke and non-stock tanks are not returnable. If you order a tank and find it is too big, too small, or unsuitable for your requirements, it can be expensive to return. Our cancellation & returns policy explains this in more detail — see Terms & Conditions.
Delivery charges
Our shipping costs cover most of the UK. However, parts of England, the Scottish Highlands and Islands (including areas north of the Glasgow / Edinburgh border), Isle of Wight, Channel Islands, Isle of Man, Anglesey, Western Isles, Shetland Islands, Orkney Islands, Isles of Scilly, Northern Ireland and the Republic of Ireland may cost more.
Please call before ordering if the delivery postcode is listed below. There may be additional shipping costs.
- AB
- BT
- CA
- CT
- DD
- DG
- EH
- FK
- G
- GY
- IM
- IV
- JE
- KA
- KW
- KY
- LD
- LL
- ML
- PA
- PH
- PO 30–41 Isle of Wight
- SA
- SY
- TD
- TN
- TR
- ZE
- Southern Ireland
Looking to avoid shipping charges?
All our tanks are available for collection ex works. Our suppliers are based all over the UK — please call if you wish to collect.
Overseas orders
International orders are welcome. Payment is by IBAN / SWIFT / BIC, MoneyGram and letters of credit. We regret that credit cards are not accepted for international orders.
A purchase order is required; we will then create a pro-forma invoice, and tanks are ordered on clearance of funds.
If you require additional export documentation — for example a Certificate of Origin, or commercial invoices certified by the Chamber of Commerce — you must notify us before completion of your order, as we will have to invoice cost and admin charges to the order.
Please call if you have any questions: +44 (0)1643 703358
Offloading
Unless a HIAB delivery has been booked at additional cost, it is the customer’s responsibility to offload with suitable equipment on the day of delivery. A failed delivery may result in additional charges.
We recommend that installers, plant hire and installation materials — excavators, aggregates and so on — are not booked until you are in receipt of the goods. Tanks Direct cannot be held responsible for costs incurred due to unforeseen delays; please see our terms for more details.
Any questions about your delivery? Contact the Sales Team on 01643 703358.
Thank you for your enquiry to return your order.
Please note, we may not be able to provide a refund for the original carriage costs paid and there may be further charges for restocking and collection to apply before your refund is processed.
Certain items may not be returnable, for example those made to order or for sanitary reasons. Please check the product page for more information.
If goods have been used, installed or are returned in less than 100% as new condition & we agree to take them back, further costs may apply. Please see our terms and conditions or contact us for more information on your specific order.
Talk to a
specialist
Sizing, regulations, installation. Our team has been answering these questions for over 25 years.
Why Tanks-Direct
22 years. 100,000+ tanks. Specialists, not generalists.
Nationwide delivery
GB and Northern Ireland covered. HIAB and crane offload available. Highlands and Islands quoted on request.
WRAS & BS EN compliant
Every potable tank is independently certified. Documentation supplied with each delivery.
Best-price guarantee
4.6/5 on Feefo from 1272 verified reviews. We price-match any genuine like-for-like quote.
Specialist advice
Trade-grade phone and email support, Mon-Fri 8am-5pm. Site visits for orders over £2,500.
