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Thanks very much. When I gave it all a fresh look, It was really hard to read but the fitting is stamped as a 3/4" and I see that now. Before seeing that I had already ordered a 3/4" copper Tee with threaded middle connector. Not a stock item at Home Depot or Lowes, but I found it on the web...

Hi, We have a very old Ex-trol ST5 Expansion tank for that has failed on the lines of small electric water heater in the basement a small office. Maybe over 45 years old? Is that possible? Whatever it is... it no longer made under that exact brand. The cross-reference replacement is an Amtrol...

Water Heater Expansion tank piping/threadng

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