SEL have developed a wide range of specialist products and components for sustainable drainage systems and brownfield redevelopment, comprising:-

Sustainable Drainage Products

Permavoid sub-base replacement system

SEL Permavoid 150mm and 85mm

SEL Permavoid Biomat 150mm - oil treatment unit

SEL Permachannel - silt and oil interception and treatment drainage channel

Flow Control Chambers

FLATAttenuation Tank Pipe Connection - with flexible membrane apron for a fully watertight seal, many diameters available, sized to suit standard drainage pipe sizes  

INVERT Attenuation Tank Pipe Connection - with flexible membrane apron for a fully watertight seal, many diameters available, sized to suit standard drainage pipe sizes  

SEL Diffuser Unit - for use within permeable pavements to allow inlets from downpipes, chambers or can be used as an outlet

Brownfield Redevelopment Products

Vent Bollards and Vents Stacks

SELGround Level Gas Vent

Biofilter odour control units for odour control when venting gas protection systems

Slotted twinwall pipe for gas collection including all fittings such as bends and t-junctions

Top hat seals for service and drainage penetrations through a gas barrier membrane

Geocomposite void former for gas collection