Cavity Closer Video 30 Mar 2011 Cavity Trays: Meet building regulations with Cavity Tray's pre-formed cavity closers. Add to Project Board Choose from existing project boards below: Or Create a new project board: The item has been added to the project board. Go to My Account to view your projects. Add to Project Board Choose from existing project boards below: Or Create a new project board: The item has been added to the project board. Go to My Account to view your projects.