The Lochinvar & A.O. Smith 100074203 Condensate Drain Port is an HVAC and water heating system component designed to provide a secure outlet for removing condensate produced during operation. It works by directing accumulated moisture from high-efficiency boilers, water heaters, or condensing heating equipment into a designated drain line for safe disposal. Used in compatible condensi... https://www.partshnc.com/drain-port-condensate-3