Climate, Inc.

By definition, the manway is the opening on the top of the tank used to allow access to the tank interior for inspection and maintenance. In rainwater harvesting, the manway is commonly used as the primary inlet for collecting rain as it flows through the system to the cistern. Manways are the openings or access points to a pressure vessel or storage tank. The number of manways, the size of the manway opening, and the manway style vary from application to application.