Find the UVBR33 (Serial# E411R / C0_E421C / R0_E431C / R0) Majestic Gas Vent Free Firebox in the diagram listings shown below. Each diagram will take you direct to the UVBR33 (Serial# E411R / C0_E421C / R0_E431C / R0) Majestic Gas Vent Free Firebox repair part listings and part views for your model.