<https://dkscaravancentre.com/product/vent-round-white-5038w/>
<http://schema.org/description>
"Round Vent 5038W Weather Resistant PlasticSize: 110mm, Wall Cut Out 80mm, Tube Connection 60mm"
<https://dkscaravancentre.com/product/vent-round-white-5038w/>