The Montigo 4 Inch Direct Vent to 5 Inch Diameter Adapter enhances the functionality of your DelRay gas fireplace. This adapter includes a DuraVent 5-inch B-Vent to DV conversion adapter, a DuraVent-Montigo collar adapter, a 4/7 male vent connecter, and an MVA conversion label. These components ensure a secure and efficient connection between your fireplace and the vent system. With this adapter, you can enjoy the warmth and ambiance of your fireplace while maintaining optimal airflow and safety.