Threshold drainage

We've only added part of the Modulock Threshold range from Harmer to the website - if you can't find what you are looking for here, please email your enquiry to or give us a call on 0800 644 44 26

Or download the Harmer Technical Manual - Threshold/Channel drainage pages 74-84 on our Downloads Page

130mm Straight Channels

The 130mm wide channels have a choice of 6 types of grate with load class K3 made from Grade 304 galvanised mild steel. Lengths slot together via tongue & groove joints.


Facade Slot Channels

Facade slot channels are located directly against a facade when a narrow slot is required. No height adjustment is provided


Terrace Slot Channels

Terrace slot channels are used for small terrace areas where paving construction depth is shallow (80-130mm).