400L Slimline Water Butt – Upright Rectangular Garden Water Tank - Space Saving Rainwater Storage

A space saving 400L slimline water butt designed for efficient rainwater collection in gardens where space is limited. Built for durability and performance, with 1x outlet and a strong structure.

The 400L slimline water butt is a high capacity, upright rainwater storage solution designed for modern gardens. Its rectangular, super slim profile allows it to sit neatly against walls, fences or sheds, making it ideal for patios, narrow walkways and smaller outdoor spaces.

Manufactured from strong, moulded virgin polymer, this heavy duty water tank offers long term durability and reliability. The integrated central baffles help maintain the tank’s shape when full, ensuring stability and strength even at maximum capacity.  

A 9 inch screw down vented lid provides easy access while helping keep debris out. Installation is straightforward, with the option to fit a rainwater diverter or overflow pipe as required.

Perfect for gardeners looking to reduce water bills, conserve water and maintain healthy plants throughout the seasons.

Avaliable in a range of colours  Millstone, White Marble and Sanstone.

Key Features

• 400 litre water storage capacity
• Slimline upright rectangular design
• 1" BSP brass threaded outlet
• Central baffles for structural strength
  
• Frost proof and weather resistant
• 9" screw down vented lid
• Linkable with additional tanks

Size

• Height: 1000mm
• Length: 1240mm
• Width: 345mm
• Weight: 26kg
• Capacity: 400 Litres
• Outlets: 2 x 1" BSP
• Lid: 9" screw down

(Sizes approximate due to manufacturing process)

Do I need to raise the water butt?

Yes, raising the water butt on a stand, bricks or sleepers is recommended to allow easy access to the tap and improve water flow. The base must be fully supported along its length. Please see 400L Water Butt Steel Support Stand | Raised Base for Slim Water Tank | Optional Add-On for the steel support stand if required as an optional extra.

Additional Information

• Tap kits and diverter kits available separately
• Metal Stand avaliable seperately
• Colour samples available on request
• Items typically delivered within 3–5 working days once dispatched
• Made to order product – lead times may extend to 5–10 working days during busy periods
• Does not include tap or diverter or stand unless selected as an additional item
• Items shipped from another location
• Made to order product – lead times are now currently 4 weeks  (May2026)