Harcostar 350 Litre Magnum Water Butt Kit

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An exceptional brand that offers premium quality, the Harcostar 350 Litre Magnum Water Butt is ideal for saving water... Read more

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Free shipping on orders over £10
Oops... Too late! Harcostar Magnums are currently out of stock due to high demand.

Why we love this product

  • This kit is supplied pre-drilled with easy-to-follow instructions
  • All accessories are expertly designed to fit with ease
  • Attractive green finish to suit all gardens


  • durable
  • easy to install
  • water saving

An exceptional brand that offers premium quality, the Harcostar 350 Litre Magnum Water Butt is ideal for saving water for larger gardens. It stores an incredible 350 litres of rainwater and comes complete with a spring-operated child-safe lid, and hose connector tap, which is situated 340mm above ground level. 

Channel the rainwater which falls on the roof of your home directly into the water butt, via the enclosed Harcostar Universal Rain Trap, which recycles your rainwater so you can water your garden, or use it for any other outdoor jobs.

The Harcostar Universal Rain Trap fits standard 68mm, 80mm and 100mm round plastic downpipes and 65mm square plastic downpipes. Please note, that it is not suitable for cast iron downpipes.

We cannot guarantee the appearance and/or colour of goods shown in our promotional literature or on our website exactly reproduce the appearance and/or colour of the physical goods themselves.

PLEASE NOTE: This bundle offer will not work in conjunction with other bundles or offers that contain any of the same products (in this case the 1050 and 700 litre Harcostar Kits ). For more details on Bundles and Offers, head over to our FAQ section

Wondering how to install your water butt? Take a look at our Water Saving Guide here.

Explore our full Harcostar range here.

  • Does not require a stand
  • Features two tap locations; for hose connection or for filling a watering can
ModelHeight (mm)Height with Stand (mm)Diameter (mm)Width per Barrel (mm)
350 Litre1200N/A780630
Shipping & returns

Free delivery for UK customers over £10. Exclusions apply. Please see our Delivery & Returns page for more information.

For orders below this amount, we charge £2.99 for delivery.

If you want to cancel your order, please contact our customer care team. Please note you will not be able to cancel your order if it already left our dispatch centre.

It might take us up to 14 days to deliver your order. Read more.

Beginner's Guide to Water Saving

Download your free water saving guide here!

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Key Points

  • Kit includes a Harcostar Universal Rain Trap to connect to almost any sized plastic downpipe.

  • Additionally comes with a spring operated child-safe lid, and hose connector tap.

  • Manufactured in the UK from recycled plastic.

Top Tip
When setting up your water butt, please ensure the full unit is sited on a flat, solid surface with no overhang or unevenness.

Quick Facts

  • Comes with a 5-year manufacturer's warranty.

  • Great way to save money on your water bills and recycle rainwater.

  • Perfect for medium to large-sized gardens.