Since 1992

ACO Raindrain Brickslot B125 Sump Unit

SKU: 47004

1 review
We have 5 in stock

£146.35 inc. VAT



The ACO Raindrain Brickslow B125 Sump Unit is a sump unit and accessory designed for use with the ACO B125 Raindrain Drainage Channel.

The sump unit is designed to allow for cleaning and maintenance of a drainage channel, and the cast iron grating will ensure that there’s no aesthetic clash with the drainage channel. Due to the fact that the sump unit is made from ACO’s high-strength polymer concrete, it boasts excellent durability. 


  • Specially designed for use with the ACO B125 Drainage Channel and a corner unit
  • Has a galvanised access cover to reinforce the product. 
  • Once sealed, it’s fully watertight. 
  • Suitable for a variety of projects.
  • Durable and environmentally friendly.
  • Fully compatible with other products from the ACO Raindrain B125 range.
  • A cost-effective solution for drainage needs. 

How to install this product:

In the product guide, the instructions to install the product are as follows:

  1. Dig the trench 318mm wide (218mm wide if against a structure) by 200mm deep for the channel (400mm deep for sump). Mark the finishing height with a fixed line 3mm below the final surface. Lay 100mm (min.) bed of concrete.
  2. Knock out the pre-formed outlet from the inside (marked with hammer symbol) or fit the sump or outlet endcap. Position sump or outlet channel on a concrete bed, fit PVC-U union/trap to drainage pipework.
  3. Lay channels starting from outlet/sump, ensuring joints connect by lowering units horizontally. Fit endcap to end channel. For fully watertight joints, use a suitable sealant.
  4. With gratings fitted, haunch around channels/sumps with concrete (suitable fill material). The final surface is to be 3mm above the grating. Bricks/paviours should be laid in mortar for lateral stability.

ACO drainage systems can be used for a variety of commercial or domestic purposes, or on industrial properties or environments. 

We have also written a blog post on how to fully install an ACO drainage system.


  • Product Name

    ACO Raindrain Brickslot B125 Sump Unit

  • Brand


  • Colour


  • Size


  • Length:


  • Width:


  • Depth:


  • Factsheet

Customers who bought this item also bought

Customer reviews


We use ‘strictly necessary’ cookies (or similar small data files) to provide you with the best possible website user experience. By clicking “ACCEPT”, you agree to such purposes. You can find out more and learn about how to withdraw your consent at any time, by clicking here: Privacy & Cookies Policy.

Cookie preferences

Google Analytics

User Experience (Strictly Necessary)

The website is built using Shopify. Shopify’s default cookies don’t collect any personal or sensitive information or IP addresses. The information that they store is not sent to any third parties, and they are used only to communicate with Shopify for the purposes of user authentication, form validation/security, and basic web application operations. To learn more, please see our Privacy & Cookies Policy.