Replacement cast iron access plate for the Horse Flame Yarrman Boiler boiler stove HF717-B. This heavy cast iron heat sink type plate sits under the removable top lid of the Yarrman Boiler. Attached with 4 Hex bolts and also fire cemented along the fire rope this removal part gives you access to the rear of the boiler and allows thorough cleaning of both the boiler and the flue.