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Wet return rotten where it meets copper

mjgordon Member Posts: 5
Single radiator branch's 3/4" wet return from a small addition built in the 50s. I realize copper to black pipe is not ideal, but it's been running this way for at least 15 years probably 30+. I replaced a similar junction a few years ago at the rear of this picture. The new problem is in the foreground. As soon as heating season is over in a few weeks here in NJ I thought I'd heat up then nearby union and replace the rotten nipple.  Can you use a dielectric joint/union here like you would on a hot water heater?  Other recommendations?  Otherwise I guess I'll just replace the rotten Piece with black pipe nipple and wait until it rots in a decade. 


  • Ctoilman
    Ctoilman Member Posts: 75
    Replace with another black nipple, or get fancy and use brass.
    EBEBRATT-Ed Member Posts: 9,106
    Just replace the nipple. We all have seen much worse
  • Larry Weingarten
    Larry Weingarten Member Posts: 2,181
    Hi, Might a plastic lined nipple be a good fit here?

    Yours, Larry
  • ethicalpaul
    ethicalpaul Member Posts: 3,019
    That's got to be like the number one failure point for any steam system so don't blame the nipple too much, it did its job. I'd say Schedule 80 steel or brass like said above. Looks like most of the corrosion there happened after it started leaking.
    1 pipe Peerless 63-03L in Cedar Grove, NJ, coal > oil > NG
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