Aluminium Box Downpipe – Internal Joiner

Connect downpipe sections seamlessly with a secure internal joiner that keeps water flowing and joints hidden.

The Aluminium Box Downpipe – Internal Joiner is a discreet and effective way to connect two lengths of aluminium box downpipe. Installed inside the pipe, this joiner maintains a smooth outer appearance while ensuring a watertight fit between sections. Made from durable, powder-coated aluminium, it's ideal for both new builds and gutter upgrades on residential or commercial properties. Built to last and easy to install, it supports a clean, professional finish.

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:

Size

£7.80

excluding shipping cost

Download Colour Chart

Features + Benefits

Joins two box downpipe sections from the inside
Provides a smooth and uninterrupted exterior finish
Made from corrosion-resistant aluminium
Powder-coated for weather protection and visual appeal
Fire-rated A2-s1,d0 for building compliance
Seamless fit with Online Metal Store box downpipe system
Helps prevent leaks and pipe separation
Lightweight, strong, and 100% recyclable
Manufactured in the UK

Specs & Options

Material: 1050A Grade Aluminium
Finish: Polyester powder-coated (RAL/BS colour options available)
Use Case: Internal connection between box downpipe sections
Fire Rating: A2-s1,d0
Lead Time: 3 to 5 working days
Custom Options: Sizes available to suit various pipe dimensions

Installation / Usage Instructions

Insert the internal joiner halfway into the first downpipe section. Apply aluminium-compatible sealant. Slide the second section over the remaining half of the joiner. Align, seal, and secure as needed.

Need a clean, hidden way to connect your box downpipes?