The Aerco 43086 Exhaust Manifold is a genuine replacement component designed for Aerco Benchmark 750 and 1000 commercial gas-fired condensing boilers. It collects combustion gases from the heat exchanger and directs them into the connected venting system for safe, controlled exhaust flow. Proper exhaust routing helps maintain efficient boiler operation and supports reliable combustion... https://www.partshnc.com/aerco-boiler-and-water-heater-43086-exhaust-manifold