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Have multiple Aetna radiators with single end valve with supply and return lines at the valve - uses what appears to be an obsolete union elbow design.
What is unusual is the capture of the union nut, with the split brass locking ring. Unfortunately, i took this unit to the wrong machine shop to have the cracks repaired and an incorrect process was used; the fitting still leaks and now there is no way to reverse the process.
I'm looking for a salvage yard that might have a 1" union, or a complete valve.
Open to suggestions. Thanks for the reply.