


150mm ID/ 172mm OD Naylor TW Spigot to 160mm UPVC Socket Reducer

160mm UPVC Spigot to 150mm ID/ 172mm OD TW Socket Reducer Naylor

225mm Naylor TW Socket to 110mm UPVC Socket Level Invert Reducer

225mm Naylor TW Socket to 160mm UPVC Socket Level Invert Reducer

300mm Naylor TW Socket to 160mm UPVC Socket Level invert reducer

225/150mm ID (172mm) D/Socket Naylor TW Drain Reducer

300/150mm ID (172mm OD) D/Socket Naylor TW Drain Reducer

300/225mm ID D/Socket Naylor TW Drain Reducer
Our Twinwall Adaptors Range
Drainfast offers a range of surface water adaptors designed to make connecting twinwall drainage systems to other pipe systems straightforward and easy to install. These adaptors help create reliable transitions between different pipe types, sizes and materials, allowing twinwall pipes to integrate smoothly with existing drainage infrastructure.
Our selection of adaptors is available in a variety of materials and sizes to accommodate a wide range of drainage requirements. Whether you are connecting twinwall pipes to clay, plastic or other underground drainage components, these adaptors provide a secure fit that supports efficient water flow and long term system performance. Looking for additional drainage fittings? Explore our full range of underground drainage adaptors to find the right components for your system.
Why Choose Drainfast?
- Vast product selection from market-leading brands
- Next-day delivery available
- Free material take-off service
- Rated ‘excellent’ on Trustpilot
- Added savings with a trade account
Surface Water Drainage Adaptor FAQs
When are surface water adaptors and reducers needed on site?
Surface water reducers and adaptors are needed wherever two drainage pipes of different sizes or materials need to be connected. This is often the case during repairs, upgrades or integrating twinwall pipes with existing clay or plastic drainage systems.
What is the difference between a surface water adaptor and reducers?
An adaptor is designed to connect pipes made from different materials or drainage systems. A reducer is used to connect pipes of different diameters. Both components help create reliable connections within a drainage system.
How to choose the correct size?
To choose the correct size adaptor or reducer, you need to know the outside diameter of the pipes being connected. Measurements should match the size range specified for the coupling or fitting. Consult with a professional to choose the right size and support a tight seal.
Are surface water adaptors compatible with all brands?
Most surface water adaptors are compatible with standard drainage pipes. It’s important to check the pipe diameter and specifications before installation.
What materials are surface water adaptors made from?
Surface water adaptors are commonly made from uPVC and other polymers. These materials are chosen for their ability to perform in underground environments.
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