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The nut broke off and had a small red ring/gasket between these connectors. I'm an noob but can follow instructions. Please give suggestions. Thanks
Below there is a water valve 
which may be used as an alternative if the above (cupper?) pipe is inconvenient to use.
Not a lot of slack on that bend, gonna be a bitch and a half working on a new compression fitting and sealing it. Dog speed, OP