Fasco Combustion Blower Mounting Gasket. This part has an outside diameter of 7" and an inside diameter of 5-3/4". Can be used with combustion blower part # 10-1111 and any combustion blower with a 7" mount and 6 bolt holes. Works with the following models:

Whitfield: Profile 20 FS - (P9), Profile 20 FS-2 - (P9), Profile 30 FS - (P10), Profile 30 FS-2 - (P10), Profile 30 INS - (P10), Profile 30 INS-2 - (P10), Optima 2 FS - (AO2), Optima 3 FS - (AO2), Optima 3 INS - (AO3), Quest Plus FS - (WP4), Quest Plus INS - (WP4), T300P - (P11), T301P - (P11), T305P - (P11), T308P - (P11)

Compatible with Whitfield Part # 61050041