Access Junctions, Pipes, Anti-Flood Gullies and Back Traps Explained

Main Elements of Drainage in Commercial Premises


Commercial drainage systems are made up of different components, each with a defined function. Access junctions, access pipes, anti-flood gullies and back traps all help in keeping the system efficient and durable over time.



Connecting the Drainage Network


Access junctions connect several pipes and create entry points for maintenance. Located at planned positions, they simplify fault finding and removing blockages. Without them, upkeep in large networks would be labour-intensive.



Making Maintenance Straightforward


Access pipes are vertical sections that permit direct entry into the system. Installed at regular points, they allow professionals to deal with obstructions and carry out routine checks. They can also act as overflow outlets, reducing the chance of wastewater causing issues indoors.



Flood Protection


Anti-flood gullies prevent surface water overwhelming drains. Useful in areas with frequent heavy rain, they maintain water flowing in the right direction, minimising the risk of overflow. For businesses, this helps keep operations safe.



Preventing Backflow


Back traps function as barriers to stop wastewater reversing back into the network. Placed in key positions, they help hygiene, limit odours, and avoid contamination inside commercial areas.



Frequently Asked Questions (FAQs)



  • What is the purpose of access junctions?
    They allow easy cleaning and maintenance.

  • Why are access pipes fitted?
    They provide vertical access points.

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  • How do anti-flood gullies work?
    They prevent surface water entering the system.

  • What is a back trap?
    It prevents wastewater flowing back.

  • Are anti-flood gullies suitable for wet climates?
    Yes, they are effective where heavy rainfall occurs.



Final Notes


Drainage in business properties relies on a combination of components. Access junctions, access pipes, anti-flood gullies and back traps each help keep systems efficient. Whether planning new systems, these parts minimise risk and secure property. For professional advice and products, consult Knowles Drainage.

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