Here are better picturesTurn on your flash
Easier to replace the whole thing while it is apart. It's like parting out a car. Individual parts could run as much if not more that the drain.If it is leaking, it can be serviced/tightened/resealed/redone to stop the leak. New washers etc.
If it is not leaking, it had in the past, but a little discoloration is nothing to be concerned about.
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