There are two functions to these Vamoose awning rails: a built-in 6mm Keder C section that lets you connect most awnings or accessories that use this standard size to your Ducato/Boxer/Relay campervan, including freestanding awnings and wind-out canopies from Fiamma or Thule, on top of serving as a rain gutter to stop rainwater from entering your campervan when you open the sliding door.
eBay