• For commercial & private use

400 Litre Water Tank Flat Baffled

Article#
Made from high-quality MDPE, this 400 litre flat water tank is designed for reliable use. Space-saving for low height installations, designed to last.
View full description
Capacity
(Litre)
400 Litre
Dimensions
(LxWxH)
125x101x35 cm
Lid Size
cm
20 cm
View all specifications
Selectable options:
drilled (open)

drilled (open)

connection of accessories possible.

not drilled (closed)

not drilled (closed)

outlet/threaded sleeve completely encased in plastic from inside - drilling possible at any time.

Selectable options:

vented

allows air exchange for pressure equalization

unvented

sealed lid for closed systems

{"5624":[{"qty":39,"shipmentDate":"March 13, 2026","delivery_time":"1-3 Days","delivery_date_range":"16 - 18 Mar"},{"qty":45,"shipmentDate":"March 26, 2026","delivery_time":"1-3 Days","delivery_date_range":"27 - 31 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"1-3 Days","delivery_date_range":"17 - 21 Apr"}],"5678":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5656":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5655":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5688":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5687":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5683":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5635":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5667":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5651":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5671":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5639":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5640":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5630":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5592":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5591":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5608":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5587":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5623":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5603":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5614":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5619":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5672":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5646":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5607":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5582":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5598":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}],"5662":[{"qty":0,"shipmentDate":"March 13, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"20 - 23 Mar"},{"qty":9999999,"shipmentDate":"April 16, 2026","delivery_time":"5-6 Weeks ","delivery_date_range":"23 - 24 Apr"}]}
{"inStock":"In Stock","deliveryTime":"Delivery Time:","deliveryBetween":"Delivery between","itemsLeft":"pc. available","available":"Available","estimatedDeliveryTime":"Delivery Time:","estimatedDeliveryBetween":"Estimated delivery between","selectLocation":"Select Location"}
{"country_id":"","postcode":"","has_address":false}
{"AT":"Austria","BE":"Belgium","CH":"Switzerland","CZ":"Czechia","DE":"Germany","DK":"Denmark","ES":"Spain","FI":"Finland","FR":"France","HR":"Croatia","IT":"Italy","LU":"Luxembourg","NL":"Netherlands","NO":"Norway","PL":"Poland","PT":"Portugal","SE":"Sweden"}
{"in_stock":"text-green-700","limited_in_stock":"text-orange-400","out_of_stock":"text-rose-700"}
{"in_stock":"text-green-700","limited_in_stock":"text-stone-700","out_of_stock":"text-orange-800"}
As low as: 435.–
526.35 Incl. Tax
90% available from stock
Secure payment: iDEAL, PayPal, Credit Card & Bancontact
Personal advice & fast support

Description / 400 Litre Water Tank Flat Baffled

400 litre flat/low-profile water tank made from high-quality MDPE – flat design, perfect for limited spaces with low height.

Features & Benefits

  • 6-7 mm wall thickness for strength and reliability
  • From high quality MDPE, roto-moulded (seamless; no welded seams)
  • Durable and impact-resistant for long service life
  • Integrated baffles reduce liquid movement and improve stability during transport
  • Food-safe, UV-resistant and chemical-resistant; REACH-compliant
  • Temperature resistant for water up to +70 °C

Installation & Handling

  • The 1" BSP outlet is standard. Choose drilled (open) for immediate use with brass connection sets, or undrilled (sealed) so the outlet remains closed until needed.
  • For adding extra connections, outlets, fillers or vents use our PP Tank Connection Sets. See our installation guide for detailed instructions.
  • 20 cm screw lid – available in vented or unvented version, selectable as required.
  • Inspection opening: 18.6 cm for easy access and cleaning
  • Dimensions: 125 cm × 101 cm × 39 cm (L × W × H incl. lid)

Applications

  • Professional & industrial: plant and mechanical engineering, OEM projects, industrial and production facilities, process and cooling water, agriculture, horticulture, construction sites
  • Mobile: campers, motorhomes, caravans, boats, yachts, service vehicles, cleaning vehicles, mobile water supply, events and emergency services
  • Domestic: rainwater harvesting, garden irrigation, toilets, washing machines, cleaning systems, household water supply and DIY projects
  • Spin Weld Outlets available on request for larger orders or OEM projects.

Drawings & Certificates

3D step file available on request. Technical drawing, WRAS food safety certificate, REACH/RoHS-compliance and chemical resistance list are available for download below.

FAQs & Installation

  • Which lid type should I choose for mobile use?
    This tank is available with a vented or an unvented 20 cm lid. For mobile applications choose the unvented lid and install an external vent using our tank vents. For stationary use, the vented lid is suitable.
  • What are baffles and why are they useful?
    They reduce liquid movement and improve stability during transport.
  • What does drilled vs. undrilled outlet mean?
  • How can I install additional connections on the tank?
  • How should I secure or fasten the water tank?

Find detailed answers and more questions in our FAQ section.

Drawings & Certificates

Resistance Chart Fluids Tanks (Size: 88 KB)
WRAS Certificate Potable Water Food Grade Temperature (Size: 2 MB)
RoHS 3 and REACH Statement (Size: 257.8 KB)
Technical Drawing (Size: 649.1 KB)

More Information

General Information
Capacity (L) 400
Dimensions (LxWxH cm) 125 x 101 x 35
Height incl. Lid (cm) 39
Shape & Type Flat Tank
Weight (kg) 30
Material & Durability
Material MDPE
Wall Thickness (mm) 6
Food-Safe Certification WRAS approved - natural / black / light blue
UV Resistance Yes
Temperature Resistance (°C) max. + 70°C
Chemical Resistance Yes with undrilled BSP Outlet
Suitable for Waste Water & Diesel Yes
Design Features
Baffles Yes
Lid Size (cm) 20 cm
Inspection Opening (cm) 18,6 cm
Lid vented selectable
Lid with Float optional
3D file available Yes, on request
Connections & Installation
BSP Connections Yes
BSP Connection Size 1"
Spin Weld Outlet possible Yes
Installation Type flat, horizontal
Mounting Options plastic-coated steel strips / stainless steel brackets / frames
Accessory Compatibility Brass & Plastic, Filters, Float-Valves

Make your order complete

,,

Tank Connection Set Brass 90° Bend Sockett: 1 Inch Knee Socket, Ball Valve and Hosetail for 25 mm Hose

56.–
In Stock
,,

Tank Connection Set Brass Straight: 1 Inch Ball Valve and Hosetail for 25 mm Hose

47.–
In Stock
Push-In BSP Fitting 1" external thread x 3/4" internal thread + EPDM Gasket - food safe

Push-In BSP Fitting 1" external thread x 3/4" internal thread + EPDM Gasket - food safe

18.–
In Stock
,,

PP Tank Connection Set 25 mm Hose 90° Bend

28.–
In Stock
,,

PP Tank Connection Set 30 mm Hose Straight

28.–
In Stock
,,

Tank Connection Set 25 mm Hose 90° Bend

22.–
In Stock
Hosetail 13 mm x 1 Inch External Thread

Hosetail 13 mm x 1 Inch External Thread

11.90
In Stock
Tank Connection Set 25 mm Hose Straight,,

Tank Connection Set 25 mm Hose Straight

22.–
In Stock
Hose 25 mm, per Meter

Hose 25 mm, Inner Diameter

5.60
In Stock
PVC Connection 1 Inch External Thread

Tank Connection 1 Inch External Thread

13.–
In Stock
PVC Ball Valve 1 Inch Internal Thread

PVC Ball Valve 1 Inch Internal Thread

26.50
In Stock
Lid Black 20 cm External Thread with Float Valve 1 Inch - 13 mm Hose Connection

Lid Black 20 cm External Thread with Float Valve 1 Inch - 13 mm Hose Connection

Lid Size 20 cm
94.–
In Stock
Lid Black 20 cm External Thread - 2 Way Vented

Lid Black 20 cm External Thread - 2 Way Vented

Lid Size 20 cm
19.–
In Stock
Lid Black 20 cm External Thread with Float Valve 1 Inch - 25 mm Hose Connection

Lid Black 20 cm External Thread with Float Valve 1 Inch - 25 mm Hose Connection

Lid Size 20 cm
94.–
In Stock
Filter ø 20 cm x 24 cm deep

Filter ø 20 cm x 24 cm deep

34.–
In Stock
Lid Black 20 cm External Thread - Unvented

Lid Black 20 cm External Thread - Unvented

Lid Size 20 cm
17.–
In Stock
Filter ø 20 cm x 12 cm deep

Filter ø 20 cm x 12 cm deep

29.–
In Stock
Filter ø 20 cm x 6 cm deep

Filter ø 20 cm x 6 cm deep

13.–
In Stock
PVC Hosetail 1 Inch External Thread x 25 mm

PVC Hosetail 1 Inch External Thread x 25 mm

3.70
In Stock
,,

Tank Connection Set Brass 90° Bend Sockett 1 Inch Knee Socket, Ball Valve and Hosetail for 13 mm Hose

57.–
In Stock
,,

Tank Connection Set Brass Straight: 1 Inch Ball Valve and Hosetail for 13 mm Hose

51.–
In Stock
Hose 13 mm, per Meter

Hose 13 mm, Inner Diameter

3.–
In Stock
Tank Vent for 13 mm Hose Straight

Tank Vent for 13 mm Hose Straight

21.–
In Stock
Geka Connection 1 Inch External Thread

Geka Connection 1 Inch External Thread

5.40
In Stock
Nipple 1 Inch External Thread

Nipple Reducer 1 Inch External Thread

6.–
In Stock
Ball Valve 1 Inch Internal Thread

Ball Valve 1 Inch Internal Thread

27.60
In Stock
Brass Connection for Gardena System 1 Inch    

Brass Connection for Gardena System 1 Inch                   

9.70
In Stock

Alternatives

460 Litre Water Tank Flat Baffled made from natural translucent Polyethylen with screw lid

460 Litre Water Tank Flat Baffled

(LxWxH) 125x110x40 cm
Lid Size 20 cm
As low as 479.–
In Stock
350 Litre Water Tank Flat Baffled made from natural translucent Polyethylen with screw lid

350 Litre Water Tank Flat Baffled

(LxWxH) 99x75x52 cm
Lid Size 15 cm
As low as 355.–
In Stock
250 Litre Water Tank Flat Baffled

250 Litre Water Tank Flat Baffled

(LxWxH) 110x82.5x32.5 cm
Lid Size 20 cm
As low as 318.–
In Stock
175 Litre Water Tank Flat made from natural translucent Polyethylen with screw lid

175 Litre Water Tank Flat

(LxWxH) 110x58.5x29 cm
Lid Size 20 cm
As low as 256.–
In Stock
210 Litre Water Tank Flat Baffled made from natural translucent Polyethylen with screw lid

210 Litre Water Tank Flat Baffled

(LxWxH) 93x63x42.3 cm
Lid Size 20 cm
As low as 275.–
In Stock
150 Litre Water Tank Flat Baffled made from natural translucent Polyethylen with screw lid

150 Litre Water Tank Flat Baffled

(LxWxH) 90x75x27.5 cm
Lid Size 12 cm
As low as 254.–
In Stock
400 Litre Water Tank Upright Baffled

400 Litre Water Tank Upright Baffled

(LxWxH) 125x35x101 cm
Lid Size 15 cm
As low as 448.–
In Stock
500 Litre Water Tank Flat Baffled made from natural translucent Polyethylen with screw lid

500 Litre Water Tank Flat Baffled

(LxWxH) 100x92x62 cm
Lid Size 20 cm
As low as 479.–
In Stock

We use Cookies

We use cookies to make our website work properly. We also integrate tools from cooperation partners for statistics on the use of our website. This serves both to optimize the website, to ensure its functionality, to create user profiles and to display interest-based advertising. Your personal data will also be processed here. This data is also disclosed for e.g. google.com, bing.com and hotjar.com. If necessary, these third parties process your personal data for additional, own purposes, together with us or on our behalf. You can find out more about google.com's privacy policy.

By clicking on "OK" you agree to the use of our cookies and cookies from third parties such as google.com. By clicking on "Open settings" you can make an individual selection and object to the use of cookies from third parties. You can find more information in our Privacy Policy for more information about how we handle privacy.

Cookie Preferences

Here you can determine which types of cookies and technologies we may use. Depending on your selection, personal data may be processed and transmitted to service providers. Some service providers may also process data in third countries. For more information, please see our privacy policy.

Essential cookies are small text files that are stored by your browser on your device to store certain information. This includes, for example, the products in your shopping cart. From the information saved and sent back, the respective website recognizes that you have already accessed and visited it with the browser of your device. We use this information to optimized design and display the website for you.
Cookies for statistical analysis collect pseudonymised information on the basis of a random identifier about how our website is used in order to improve its attractiveness, content and functionality. These cookies help us to determine whether, which, how often and for how long subpages of our website are visited and which content users are particularly interested in. Furthermore, e.g. search terms, the country or region of access, as well as the proportion of mobile devices that access our websites are recorded. We use this information to create statistics to customize the content of our website to your needs and to optimize our offer. The legal basis for this collection and processing is our legitimate interest (Art. 6 Para. 1 Point f GDPR). You can object to this processing.
Preference cookies enable our website to remember information that affects the way our website behaves or looks, like your preferred language or the region you are in. The legal basis for this collection and processing is our legitimate interest (Art. 6 Para. 1 Point f GDPR). You can object to this processing.
These cookies are set by external advertising partners and are used to create profiles and track data across multiple websites. If you accept these cookies, we can show our advertisements on other websites based on your user profile and your preferences. These cookies also store data on how many visitors have seen or clicked on our advertising in order to optimize advertising campaigns. The legal basis for this collection and processing is our legitimate interest (Art. 6 Para. 1 Point f GDPR). You can object to this processing.