Copper Pipe Size
This is probably a stupid question but here goes. I am making a repair to a copper pipe line in our 1971 Airstream. I can't figure out what is the exact size of the pipe that I am repairing. I need to know because I want to insert a piece of pex piping and use shark bite fittings to complete the repair. Before I buy any parts I need to know what size I am looking for. The pipe is located in the rear bath area and runs along the floor under the lip that exists between the bath and the hallway. Any help would be appreciated.
2005 Nissan Titan