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How to Unscrew & Replace Leaking Elbow in Water Pipe: Step-by-Step Guide & Precautions

blackwolf7 25116 19
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How do I safely unscrew and replace a leaking elbow or valve in a water pipe without damaging the installation?

Turn off the water first, then unscrew the fitting counterclockwise with an ordinary hydraulic/adjustable wrench [#17537566] If there is a short stub or extension protruding from the wall, hold it with a second wrench while loosening the leaking part so you do not twist the wall fitting [#17537556][#17540790] It can also help to open the lowest cold-water tap, such as in the bathtub, to drain the pipes and reduce spilling before you start [#17539113]
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  • #1 17537546
    blackwolf7
    Level 6  
    Posts: 32
    Rate: 11
    I have a problem because water is leaking from my elbow, and I do not know how / how to unscrew it to replace it and also not to spoil something more.
    How to Unscrew & Replace Leaking Elbow in Water Pipe: Step-by-Step Guide & Precautions How to Unscrew & Replace Leaking Elbow in Water Pipe: Step-by-Step Guide & Precautions
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  • #2 17537556
    korystor
    Level 19  
    Posts: 372
    Help: 35
    Rate: 102
    the so-called Frog or adjustable wrench. It is not an elbow, it is a valve. Unless it's an elbow in the wall. You will need two wrenches in total, with one you should hold the stub sticking out of the wall.
  • #3 17537562
    ciuqu
    Level 38  
    Posts: 3279
    Help: 512
    Rate: 823
    I suggest using even two "frogs" and one to hold the pipe sticking out from the wall.
  • Helpful post
    #4 17537566
    Rezystor240
    Level 42  
    Posts: 9240
    Help: 689
    Rate: 1647
    @ blackwolf7

    Of course it can be unscrewed with an ordinary hydraulic wrench.
    First turn off the water in the apartment because you will have an unpleasant surprise.
    You know, unless we unscrew it to the left. (it's just a reminder)

    Added after 2 [minutes]:

    ciuqu wrote:
    one to hold the tube sticking out from the wall.
    korystor wrote:
    You will need two wrenches in total, with one you should hold the stub sticking out of the wall.


    What?!

    After all, all that is sticking out of the wall is a valve.
    Don't tell stupid things.
  • #5 17537593
    ciuqu
    Level 38  
    Posts: 3279
    Help: 512
    Rate: 823
    Yeah fact :) it would be worth scratching the grout around the valve a little.
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  • #6 17539075
    Covul
    Level 18  
    Posts: 192
    Help: 29
    Rate: 49
    Or even shoe up to the fitting into which the valve is screwed.
  • #7 17539113
    E8600
    Level 41  
    Posts: 8858
    Help: 525
    Rate: 2474
    Rezystor240 wrote:
    After all, all that is sticking out of the wall is a valve.

    Exactly.

    Covul wrote:
    Or even shoe it to the fitting into which the valve is screwed.

    To do some work?
    The fitting is probably sitting in the wall and nothing should happen. Worse, I would have to worry that the valve would not break and the thread in the wall would not remain, because these types of valves only look nice and are quite delicate and the durability is tragic.
    Before playing, turn off the cold water on the main valve in the bathroom and turn on the cold tap in the bathtub and let the water run out of the pipes - there will be less wiping. Therefore, in the bathtub, because this tap is usually the lowest.
  • #8 17540790
    stanislaw1954
    Level 43  
    Posts: 15002
    Help: 1981
    Rate: 4560
    And in my opinion, this valve is screwed into the extension, which in turn is screwed into the elbow or the tee in the wall. Therefore, you need to hold the extension with one key to unscrew only the valve itself.
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  • #9 17541175
    blackwolf7
    Level 6  
    Posts: 32
    Rate: 11
    Just to hammer the wall and tiles again to get to the extension: / I will take the risk and hope that if there is a tee in the wall and it will not unscrew.
  • #10 17541537
    Rezystor240
    Level 42  
    Posts: 9240
    Help: 689
    Rate: 1647
    stanislaw1954 wrote:
    And in my opinion, this valve is screwed into the extension,


    Your opinion is wrong.

    Added after 37 [seconds]:

    blackwolf7 wrote:
    I hope that if there is a tee, it is in the wall and it will not unscrew.


    Nothing is allowed to move in the wall.
  • #11 17542936
    korystor
    Level 19  
    Posts: 372
    Help: 35
    Rate: 102
    "Nothing is allowed to move in the wall."

    Of course, the wall has the right to move or even break off, it does not have to be a tee and it does not have to be galvanized, it is not known who did it. Unscrew sensitively.
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  • #12 17543207
    mczapski
    Level 40  
    Posts: 6227
    Help: 467
    Rate: 1652
    A typical cast iron fitting would have a flange at the end. And here you can not see it, So that the valve will not be screwed into the elbow or the tee. There is an extension, reduction or a muff, which can be made of steel or brass. So, when unscrewing, I would try to grab the element protruding from the wall and there is not much of it to grasp. And there may be a plastic pipe in the wall.
  • #13 17545131
    Anonymous
    Level 1  
  • #14 17545186
    E8600
    Level 41  
    Posts: 8858
    Help: 525
    Rate: 2474
    Buddy corner of the bathtub is visible in the 1st photo.
    101pawel wrote:
    On Mars, do you all have master valves in the bathrooms?

    In apartments in blocks of flats there is always a valve in front of the meter.
  • #15 17545458
    Rezystor240
    Level 42  
    Posts: 9240
    Help: 689
    Rate: 1647
    E8600 wrote:
    In apartment blocks there is always a valve in front of the meter.


    It doesn't mean there can't be one behind the meter.
  • #16 17546261
    Anonymous
    Level 1  
  • #17 17546294
    E8600
    Level 41  
    Posts: 8858
    Help: 525
    Rate: 2474
    Rezystor240 wrote:
    That doesn't mean there can't be one behind the meter.

    But it is in the basement and it is not always easy to access in the block.
    101pawel wrote:
    I still can't understand how, on the basis of this one photo, you came to the conclusion that col. Blackwolf7 lives in a block of flats. It's OT, of course, but it bothers me? Why does the visible corner of the bathtub determine this? That's amazing.

    I used a glass ball. :) The author has probably already solved the topic, so there is no point in further exploring.

    In order to prevent further unnecessary posts, the residents of single-family houses usually have some idea about installations and repairs, so they do not ask on the forum but take the key or the neighbor with the key and replace it (especially since the author's problem was quite simple / basic).
  • #18 17546522
    Rezystor240
    Level 42  
    Posts: 9240
    Help: 689
    Rate: 1647
    E8600 wrote:
    But it is in the basement and it is not always easy to access in the block.


    Once again it is confirmed that the point of view depends on the point of sitting.

    Behind the counter- at home.
    In front of the meter - also at home, but the rest of the pipe runs off vertically.

    So much for this topic.
  • #19 17557779
    blackwolf7
    Level 6  
    Posts: 32
    Rate: 11
    I unscrewed this elbow without holding the extension because I would have to knock off the tiles and walls a bit and I think nothing moved because you can't see any leaks, so I think it works and thanks people for your help :) But I have one more question, taking advantage of the opportunity, because now I heard at night how the water was dripping inside the tank all the time, and the frog is not running water in the shell, so I don't know what's going on. Unless it leaks into the shell but so slowly that you can't see it? Anyone know what this might be about?
  • #20 17557966
    ta_tar
    Level 41  
    Posts: 6438
    Help: 693
    Rate: 2027
    If you are dripping in the shell tank, check the fill valve. You may not see in the shell at first because you have a good gasket in the drain valve. But if the water level above the bell is measured, the leakage from the tank may only be visible. See if you can see that the water is dripping near the filling valve.
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Topic summary

✨ The discussion revolves around the process of unscrewing and replacing a leaking elbow in a water pipe, with users providing step-by-step guidance and precautions. Key steps include turning off the water supply, using appropriate tools such as adjustable wrenches (referred to as "frogs"), and ensuring that the valve or fitting is held securely while unscrewing. Participants emphasize the importance of being cautious to avoid damaging the valve or the threads in the wall. There are also considerations regarding the potential for leaks from the tank and the need to check the fill valve if water is dripping. The conversation highlights the variability in plumbing setups, particularly in different types of buildings.
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FAQ

TL;DR: Use two wrenches to remove a leaking angle valve; "You will need two wrenches in total." Shut off water first to avoid damage. [Elektroda, korystor, post #17537556]

Why it matters: This FAQ helps DIYers fix a leaking bathroom angle valve without cracking tiles, twisting hidden fittings, or flooding rooms.

Quick Facts

How do I unscrew and replace a leaking angle valve without damaging the wall?

Follow this 3‑step method:
  1. "First turn off the water in the apartment."
  2. Put an adjustable (hydraulic) wrench on the valve and turn counterclockwise.
  3. Swap the valve and tighten gently to seal. This simple approach avoids surprises and respects thread direction. [Elektroda, Rezystor240, post #17537566]

What tools prevent twisting the in‑wall fitting while I loosen the valve?

Use two adjustable wrenches. Hold the stub coming out of the wall with one wrench. Turn the valve body with the other wrench. "You will need two wrenches in total." This two‑wrench method greatly reduces stress on hidden joints. [Elektroda, korystor, post #17537556]

Which way do I turn the valve to loosen it?

Loosen standard angle valves counterclockwise. In other words, turn it "to the left." Most domestic valves use right‑hand threads. That direction avoids cross‑threading and damage. Confirm your grip is square before applying force. [Elektroda, Rezystor240, post #17537566]

Do I need to scratch grout or remove tiles to access the extension?

Sometimes you must expose more metal for a safe grip. Lightly scratch or remove grout around the escutcheon to access the hex or extension. Work carefully to avoid tile chips. This small clearance can enable the two‑wrench method. [Elektroda, ciuqu, post #17537593]

What if the wall or fitting starts to move while I’m loosening?

Stop and reassess your counter‑hold. The wall or fitting can move or even break. Apply controlled torque and improve access if needed. "Unscrew sensitively." Increase support, then continue only when movement stops. [Elektroda, korystor, post #17542936]

Where should I shut off and drain the line before starting?

Shut the cold water at the main bathroom valve by the meter. Then open the bathtub’s cold tap to drain the line. The bathtub is usually the lowest point, so it drains best. This reduces mess during removal. [Elektroda, E8600, post #17539113]

Is this fitting an elbow or a valve?

It’s a valve, not an elbow, unless the elbow is inside the wall. The visible part is the angle valve body. Identifying it correctly helps you choose the right replacement and tools. "It is not an elbow, it is a valve." [Elektroda, korystor, post #17537556]

What hidden parts might be behind the escutcheon that affect removal?

There may be an extension, reduction, or muff between the valve and in‑wall fitting. These parts can be steel or brass. Some installations transition to plastic pipe in the wall. Limited protrusion reduces gripping options. Plan a counter‑hold accordingly. [Elektroda, mczapski, post #17543207]

Could the valve break and leave threads in the wall?

Yes, that’s a real failure mode with delicate decorative valves. The body can snap, leaving threaded remnants in the wall fitting. Work gently and square. "These types of valves only look nice and are quite delicate." [Elektroda, E8600, post #17539113]

I can’t brace the extension without removing tiles—can I try loosening anyway?

Some users have loosened the valve without bracing and saw no leaks afterward. Proceed only if you accept the risk and inspect closely. One poster reported success without holding the extension and no signs of movement. Monitor after reassembly. [Elektroda, blackwolf7, post #17557779]

Should I brace or “shoe” directly to the in‑wall fitting?

You can add support by bracing up to the fitting the valve screws into. This reduces torque on concealed joints. Fit a support carefully to avoid damaging finishes. Recheck alignment before turning. [Elektroda, Covul, post #17539075]

Should anything in the wall move during this work?

Aim for zero movement within the wall. Secure a counter‑hold and keep torque controlled. "Nothing is allowed to move in the wall." If anything shifts, stop and improve support before continuing. [Elektroda, Rezystor240, post #17541537]

In an apartment, is there always a shutoff near the meter?

Yes, flats typically have a shutoff valve ahead of the water meter. That location simplifies isolation for small plumbing tasks. Look near the meter before starting work. Close it fully to prevent leaks. [Elektroda, E8600, post #17545186]

My toilet tank drips silently at night—what should I check first?

Inspect the fill valve for seepage. If the level rises above the overflow bell, water leaks invisibly into the bowl. Look for slow dripping near the fill valve body. Replace or service the fill valve if needed. [Elektroda, ta_tar, post #17557966]
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