Threshold Drain

Slimline domestic level threshold door drainage

Manufactured from extruded plastic with an aluminium or steel grating, ACO Threshold Drain eliminates water ponding at house entrances, or around your patio.

ACO Threshold Drain comes complete with either a silver or black aluminium, CorTen steel or stainless steel Heelguard grating suitable for pedestrian traffic.

The discreet system has a width of 60mm and is available in 1m lengths.

With a range of accessories available from corner units to ø110mm vertical outlets, it is now possible to use as part of a modern patio drainage system

The system is compliant with Part M of the Building Regulations for England and Wales and Section 4 of the Scottish Building Standards

New additions to the range

New Threshold Drain Stainless Steel

ACO Threshold Drain channels and corner units with stainless steel grate

A one-metre channel and corner unit are now available. All of the current Threshold Drain accessories can be used on these new items. 

Using grade 316 stainless steel on the visible parts of the grate to ensure a long life performance and grade 304 stainless steel used for functional elements underneath the channel.

This means the grate delivers a quality finish perfect for building thresholds and patios.

New Threshold Drain CorTen

ACO have launched an additional Threshold Drain in a new CorTen finish.

The patina finish is being seen more and more in high-end garden and landscape projects, with products from planters to walls being offered by a range of manufacturers, the finish can enhance a space and textures felt and seen within it.

There are some specifics to consider when using this finish on a product; CorTen develops its characteristic rusty appearance after it has been exposed to rainwater, therefore new stocks may look black when first delivered. This surface, the so-called patina, is an oxidation layer that protects the metal from further corrosion. During formation of the patina, the rainwater may also get a rusty brown colour and therefore can leave stains when it comes into contact with other (porous) surfaces.

It is of great importance to install the channel 3-5mm below the adjacent paving level, such that during heavy rainfall, no water will flow back on the paving. When using very porous paving material and/or light coloured paving, it is recommended to allow the CorTen gratings to corrode on a safe location and only install them on the channels when the patina has fully developed.

ACO bears no responsibility for stains on paving when using CorTen gratings. In case of doubt, we recommend to use our aluminium gratings with this channel.


  • Quick and easy installation
  • Removable Heelguard aluminium grating available in silver or black
  • Modern styling
  • Outlet available for connection to underground drainage
  • CE marked and fully certified to Load Class A 15 BS EN 1433:2002


  • System ideal for use with 60mm block paving
  • Body of the unit manufactured from extruded plastic
  • Compliant with Part M of the Building Regulations for Endland and Wales and Section 4 of the Scottish Building Standards

Recommended Applications

  • Patios and Paths
  • Level Thresholds
  • Block Paving

Not Recommended Applications

  • Car Parking Areas

Threshold Drain accessories

Application areas

Patio drainage

Click the image above to learn more about patio drainage options and tips from ACO.

Building thresholds

Click the image above to learn more about building threshold drainage options and tips from ACO.

Related Products

DoorWay Drain
DoorWay Drain

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HexDrain Brickslot
HexDrain Brickslot

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Load Class N/A

Featured Downloads

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Threshold Drain brochure
Threshold Drain brochure

ACO Threshold Drain brochure overview and accessories list

Building + Landscape Brochure
Building + Landscape Brochure

Design inspiration for domestic landscaping projects

ACO Threshold Drain installation drawing
ACO Threshold Drain installation drawing

For correct installation detail of ACO Threshold Drain

Sustainable design brochure
Sustainable design brochure

Sustainable design, finding the real growth in gardens. An ebook for garden designers and landscapers