Abstract: A plumbing assembly is disclosed that comprises an access panel which allows increased access to a temperature and humidity control system such as a heating or air-conditioning system. The access panel includes at least one valve for controlling the flow of a fluid and communicates with the first end of a first piping assembly. The second end of the first piping assembly communicates with a second piping assembly typically through a valve situated within the second piping assembly. The second piping assembly is part of a temperature and humidity control system and is generally in fluid communication with a heat transfer coil in the temperature and humidity control system. The access panel allows a technician or inspector to service or inspect a heating or air-conditioning system without the risk of injury and the cost associated with conventional methods.