These Trims are typically used as decorative covers when installing a wall thimble in a gas stove application.
On vertical installations they can serve as firestops when installed from below. They can also serve as a firestop on horizontal installations that don’t require a wall thimble (i.e. a fully non-combustible wall). The Trim Ring (TR) is larger and round and the Trim Plate (TP) is smaller and square. Available in black only.