✅ SOLVED Heavy Copper Fitting

[AKSasquatch]

Found this heavy corroded copper fitting on a beach. Appears to have two shouldered areas for tightening and the other side had some faint remanents of grooving that might be external threads but only about three threads deep.

Any thoughts?

 

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[ticndig]

it reminds me of a toilet closet spud , used on commercial toilets

 

[Tony in SC]

Looks kinda like the packing nut for an old water pump?

 

[Blackfoot58]

Looks like a packing nut, possibly from behind the propeller on an old boat motor.