<https://trilitebyopti.co.uk/product/opti-trilite-100-series/opti-trilite-junctions/triangular-junctions/3-way-triangular-junctions/100-series-triangular-3-way-junction-90-apex-down-3/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://trilitebyopti.co.uk/?attachment_id=526>