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Aluminium Box Gutter – Union Joiner

Get a perfect fit every time with this secure aluminium joiner for box gutters, made to last and easy to install.

The Aluminium Box Gutter – Union Joiner is a key component in creating strong, seamless connections between aluminium box gutter sections. Designed to maintain alignment and ensure watertight joints, this joiner is built from high-grade, corrosion-resistant aluminium for long-term use in all weather conditions. Whether you're working on a residential, commercial, or industrial project, this part provides the strength and precision needed to support gutter systems efficiently. Each joiner is fabricated by the team at Online Metal Store in Essex, ensuring a perfect match with our full box gutter system. 

Please refer to the attached RAL colour chart to view available options. At checkout, enter your chosen RAL colour in the designated box. 

Choose a variant:

£5.40
excluding shipping cost

Features + Benefits

  • Creates a clean and reliable joint between gutter sections

  • Compatible with 100mm, 125mm, and 150mm box gutter systems

  • Resistant to corrosion and built to last over 20 years

  • Quick installation reduces labour time on site

  • Designed for perfect alignment and watertight performance

  • Works for both indoor and outdoor applications

  • Precision-cut for secure and stable joins

  • Lightweight aluminium for easier handling and transport

  • Manufactured in the UK by Online Metal Store

  • Available in mill finish or powder-coated on request

Specs & Options

  • Material: 1050A Grade Aluminium

  • Finish: Mill finish (powder coating optional)

  • Fire Rating: Non-combustible

  • Lead Time: 3 to 5 working days

  • Compatibility: Matches full aluminium box gutter range

  • Custom Options: Available on request

Installation / Usage Instructions

Align both gutter sections with the union joiner and insert it at the joint. Secure using the appropriate sealant or mechanical fixings for a watertight seal. Ensure correct slope is maintained to allow smooth water flow.

Need a strong, reliable connection between gutter lengths? 

Our aluminium box gutter union joiners ensure seamless flow and quick installation. Order now or speak with the Online Metal Store team for sizing support or custom finishes.