Dresser coupling with galvanized pipe

shnaig

I'm repairing a rusted out 1/2" galvanized pipe in the wall which went to a spigot for the washing machine. All the connections were pretty seized so I had to cut the pipe. I'm using a dresser compression coupling to connect the old cut pipe to the new installed pipe in a vertical installation. The new section of pipe comes out of the coupling to a tee and continues upward creating an air chamber which is capped. The problem is when I turned on the water to test for leaks the new section of pipe popped out of the dresser coupling. Is this to be expected because the new section was unsecured? Is it a requirement to have both ends secured from movement when using this type of coupling?

joecaption

It was time to bite the bullet long ago and just replace all of that old pipe. If it has already leaked one place there's a 100% chance it's going to leak someplace else.

shnaig

Yes, I agree that would be nice; however, that would require removing a substantial part of the wall which I don't have time for right now. Do you have a response to any of my questions?

plumberman134

Shouldn't be a problem dead ending off of a dresser.im assuming you put galvanized or brass in both ends of the dresser.copper won't hold.

sanec1

Dresser couplings usually work really well. You may need to take it all apart and insure you have the new pipe fully inside the dresser. Then hold the dresser with one wrench and use another to tighten the coupling onto the new pipe.

shnaig

Galvanized on both ends which were fully in the coupling. Have you ever "dead ended" off of a dresser coupling where the dead end is not secured? Why do you think the pipe popped out?

TheEplumber

Probably not tight enough. A trick I've seen done before- span the dresser with electricians grounding wire and use their grounding clamps to anchor to the pipes

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shnaig

The connections were very tight. Interesting solution with the grounding clamps. The fact that you've seen this setup implies that the pipe does need to be secured regardless whether it's tight or not. Did you see this trick in a setup where one side of the coupling was a dead end?

TheEplumber

TBH, I've only used a dresser a couple of times and they were on buried lines. I don't trust them nor does my inspectors.
It's best that you get the pipe out of the fitting. Put some heat on the fitting and use cheaters on your wrenches. It'll come off

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shnaig

The next fitting below is an elbow and I'm afraid if I remove the pipe that the elbow will be unusable because it's rusty. Then I will have to go further to the next fitting and have to tear the whole wall out. Would the heat make it that much easier? Would you recommend penetrating oil also?

ben's plumbing

yep heat as eplumber said it will come out get rid of dressler cuppling and repipe us a union ....ben...