A backwedge, also known as a back-cut gasket, is a type of gasket used to seal two surfaces together. It is made of a flexible material, such as rubber or silicone, and has a sloping, wedge-shaped edge along one side. The backwedge is typically used in applications between glass and aluminium frame.

The VW5X designation refers to a specific type or model of backwedge gasket.