The Lochinvar and A.O. Smith 100093870 Manifold Door Assembly is a replacement combustion component designed for compatible gas-fired water heaters and boiler systems. It serves as a mounting and sealing assembly around the burner manifold area, helping maintain proper positioning and containment of combustion components during operation. This assembly is used in compatible Lochinvar ... https://www.partshnc.com/100093870-lochinvar-ao-smith-manifold-door-assy