The Vinyl Sleeves are for increasing the size of hangers that go on the Solid Non Insulated grooved covers. Some grooves are a little bigger than others and require a sleeve to create a tighter fit. We tell our customers to use the pencil test. If the pencil fit tight in the groove between the roof panel and the header beam, you might not need the vinyl sleeves but if the pencil moves around and is loose then we recommend getting the vinyl sleeves. Just use soap and water to slide on the vinyl tubbing.
The sleeves are only for the following:
Solid Non Insulated Alumahangers
Solid Non Insulated Shade Hangers