Lynn Manufacturing Burner Head Protector, Ceramic Fiber 2300F, Beckett, 4'' O.D. PRODUCT INFO: Burner head protector for oil-fired boilers and furnaces. Vacuum cast ceramic fiber chamber rated to 2300F. FIT: Beckett burners with 4'' OD tube DIMENSIONS: 4-3/4'' OD x 4-1/16'' ID x 2-9/16'' Made in the USA by Lynn Manufacturing, Inc. Lynn Item 1030