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Connecting LG F4WV710P1, RC90V9AV3Q Washer and Dryer to Single 3m Drain: Water Retraction Issues

misiek-puchatek 25194 19
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How can I connect a washer and dryer to one drain 3 m away without wastewater backing up into the dryer hose, and is that backflow harmful?

The backflow is caused by the tee arrangement, and it can negatively affect the dryer, so the current shared setup is not a good solution [#19037869] The best fix is to use separate drain hoses for the washer and dryer, with the proper hose diameters/couplings available in shops [#19037869] Another recommended approach is to remove the siphon and extend the wall drain to a point near the machines, then connect both hoses with a suitable tee directly there, without hose extensions [#19037964]
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  • #1 19035981
    misiek-puchatek
    Level 11  
    Posts: 30
    Rate: 8
    I have purchased an LG F4WV710P1, RC90V9AV3Q washing machine and dryer and would like to connect them to one drain which is about 3m away. I was advised to buy a tee, but I noticed that it sometimes leaks a little and in addition, water from the washing machine flows up the hose up to the dryer. Is this water retraction not harmful? Or maybe there is another better solution?

    Connecting LG F4WV710P1, RC90V9AV3Q Washer and Dryer to Single 3m Drain: Water Retraction Issues Connecting LG F4WV710P1, RC90V9AV3Q Washer and Dryer to Single 3m Drain: Water Retraction Issues Connecting LG F4WV710P1, RC90V9AV3Q Washer and Dryer to Single 3m Drain: Water Retraction Issues Connecting LG F4WV710P1, RC90V9AV3Q Washer and Dryer to Single 3m Drain: Water Retraction Issues
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  • #2 19036528
    stanislaw1954
    Level 43  
    Posts: 15002
    Help: 1981
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    Is this tripod, or maybe the tee, has the same diameters to connect, because the hoses are rather different diameters. In addition, is the common hose at least the same diameter as that of the washing machine? The drainage of this siphon has to be checked if it is not clogged. because there it is possible to clog with hair or fluff from washing.
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  • #3 19036699
    misiek-puchatek
    Level 11  
    Posts: 30
    Rate: 8
    stanislaw1954 wrote:
    Is this tripod, or maybe the tee, has the same diameters to connect, because the hoses are rather different diameters. Additionally, is the common weighing at least the same diameter as that of the washing machine? The drainage of this siphon has yet to be checked if it is not clogged. because there it is possible to clog with hair or fluff from washing.

    It has the same diameter, but I bought a new electrolux dryer hose, which has one narrow for the dryer and one more or less close to a tee, this common extension hose is also about the same diameter as the washing machine and everything is tightly twisted with clamps. The siphon is unobstructed, I even removed the ball from inside. As for the leakage on the tee, it can still be secured by clamping in the right places and very tightly, but I'm more worried that the water goes through the hose to the dryer during washing.
  • #4 19036729
    stanislaw1954
    Level 43  
    Posts: 15002
    Help: 1981
    Rate: 4560
    misiek-puchatek wrote:
    I am more worried that the water also goes to the dryer during washing.
    During washing or when pumping the dirty water out of the washing machine?
  • #5 19036896
    Gobro
    Level 31  
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    After all, the dryer is standing on the washing machine, so the water uphill to the dryer will not go unless the drain is blocked.
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  • #6 19037234
    misiek-puchatek
    Level 11  
    Posts: 30
    Rate: 8
    stanislaw1954 wrote:
    During washing or when pumping the dirty water out of the washing machine?
    While the water is being pumped out. This is how I thought that water should not go up, but at the height of the connection to the dryer, the water still comes in, only when the hose is straightened to the height of the entire dryer, the hose does not pour out of the hose.
  • #7 19037489
    Kenworth 18
    Level 43  
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    You should use the tee only at the drain pipe in the wall: https://images.app.goo.gl/n3ikDtA8edzLEyRH6 turn the water tap by 180 ° because for the mechanical Aqua Stop to work, it must point vertically downwards.
    Arrange the washing machine hose in the inverted U, you should find the mention of this in the washing machine manual.
  • #8 19037520
    misiek-puchatek
    Level 11  
    Posts: 30
    Rate: 8
    I would install such a tee, but the hose from the washing machine and dryer will not get, and if the washing machine and dryer stand at the drain, it will cover the window. I understand to decorate the U drain upside down, should I turn the siphon up?
  • #9 19037575
    Kenworth 18
    Level 43  
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    Invert the valve: https://e-metalowiec.com/zawor-schell-katowy-...OIbaNoP8wQnahNoP8wQnahNoP8wQnahNoP5CrOIbaNoP5
    My point was to extend the drain hose of both the washing machine and the dryer, I did not write that you should move the device. You used a tee and the connection is leaky as you write yourself.
    Lay the drainage hose in an inverted U. Take a look at the instruction manual and you will probably find a note of this.
  • #10 19037798
    misiek-puchatek
    Level 11  
    Posts: 30
    Rate: 8
    Kenworth 18 wrote:
    Reverse the valve: https://e-metalowiec.com/zawor-schell-katowy-...UrOIwntP8wjbaNi5Dr1ERokRIcCFnZahoCauoQAvD_BwE 180 °
    I understood that.
    Kenworth 18 wrote:
    My point was to extend the drain hose of both the washing machine and the dryer, I did not write that you should move the device. You used a tee and the connection is leaky as you write yourself.
    I decided on a tee, because I did not find the dryer hose so long, and I would also have to use an extension to extend it. I was able to seal the tee with clamps, twisting them with all my strength in the right place, especially in the dryer hose, because mainly in this connection there was a problem with tightness, but the problem with water drainage when water was pumped out of the washing machine remained, i.e. water flows into the drain and up into the dryer. I don't know if it has any effect on drying and washing, but it bothers me.
    Kenworth 18 wrote:
    Lay the drainage hose in an inverted U. Take a look at the instruction manual and you will probably find a note of this.
    In the manual it is mentioned, there is even a special plastic kit for this, but it is rather for the wash basin etc. in the manual they mentioned.
  • Helpful post
    #11 19037869
    Kenworth 18
    Level 43  
    Posts: 10999
    Help: 2387
    Rate: 3660
    I think that it is this tee that causes the washing machine, draining the water, forcing the water into the dryer hose and this may have a negative impact on the dryer and therefore separate drain hoses from both devices would solve this problem.
    Hoses that can be used to connect to the original are available in shops as well as couplings of various diameters.
  • Helpful post
    #12 19037964
    zhudomel
    Home appliances specialist  
    Posts: 4991
    Help: 1279
    Rate: 3358
    Remove the siphon. Extend the wall drainage above the radiator towards the washing machine. End above or behind the 3rd plate next to the washing machine and connect both hoses with a suitable tee (s) without extensions.
    Kenworth 18 wrote:
    turn the water tap 180 ° because the mechanical Aqua Stop must point vertically down to work.
    - not true, it can be as it is.
    Kenworth 18 wrote:
    Place the washing machine hose in an inverted U
    - what for? It's good.
    Kenworth 18 wrote:
    This tee causes the washing machine to force the water into the dryer hose while draining the water
    - of course.
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  • #13 19038043
    misiekpb
    Level 22  
    Posts: 661
    Help: 35
    Rate: 144
    Kenworth 18 wrote:
    because the Aqua Stop must point vertically down for the mechanical effect to work.


    Sorry about offtop, but you raised an important point.
    This hose does not work under pressure by accident? This is how I was explained upon purchase.
    I mean, if I have it horizontally, then W won't work?
  • #14 19038167
    Kenworth 18
    Level 43  
    Posts: 10999
    Help: 2387
    Rate: 3660
    Buddy @misiekpb, I wrote only what the former administrator of the household appliances department, Mr. @skryn, always repeated. To the question you asked, the answer was to always point the hose vertically downwards when installing it because this is to ensure its correct operation in the event of a leak.
  • #15 19038264
    misiek-puchatek
    Level 11  
    Posts: 30
    Rate: 8
    zhudomel wrote:
    Remove the siphon. Extend the wall drainage above the radiator towards the washing machine. End above or behind the 3rd plate next to the washing machine and connect both hoses with a suitable tee (s) without extensions.
    if I had known that there would be such a problem, I would probably have done it right away, but they advised me in the shop, it's just a waste of money for snakes, it's good that at least the most expensive inflow will be useful. Now I will connect the dryer for now and leave it on the tank and I will probably look for someone to extend this sewerage to me, because I will probably spartan myself.
  • #16 19038376
    zhudomel
    Home appliances specialist  
    Posts: 4991
    Help: 1279
    Rate: 3358
    misiekpb wrote:
    This hose does not work under pressure by accident?
    - no, this is a mechanical absorption aquastop.
    misiekpb wrote:
    I mean, if I have it horizontally, then W won't work?
    - will work.
    But it is installed inadequately (i.e. simply ugly).
  • #17 19038393
    misiekpb
    Level 22  
    Posts: 661
    Help: 35
    Rate: 144
    zhudomel wrote:

    But it is installed inadequately (i.e. simply ugly).

    That's why it's mounted horizontally, because it hides behind the washing machine and you can't see it. So it's not ugly ?.
  • #18 19040429
    zhudomel
    Home appliances specialist  
    Posts: 4991
    Help: 1279
    Rate: 3358
    misiekpb wrote:
    That's why it's mounted horizontally, because it hides behind the washing machine and you can't see it.
    I think you misunderstood something. The aquastop valve is on the inlet hose and there is perpendicularly (but you can say "upside down") screwed to the tap on the water pipe. He's not hiding anywhere. This does not affect its operation, but it looks unattractive. In addition, the inflow and outflow could be further apart.
  • #19 19040484
    misiekpb
    Level 22  
    Posts: 661
    Help: 35
    Rate: 144
    I mean my Aqua Stop :)
    So, to sum up, the mounting position does not affect its operation?
  • #20 19042469
    zhudomel
    Home appliances specialist  
    Posts: 4991
    Help: 1279
    Rate: 3358
    misiekpb wrote:
    I mean my Aqua Stop
    Me too.
    misiekpb wrote:
    the mounting position does not affect its operation?
    Not.
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Topic summary

✨ The discussion revolves around connecting an LG F4WV710P1 washing machine and RC90V9AV3Q dryer to a single drain located 3 meters away. The user experiences water retraction issues, where water from the washing machine flows back into the dryer during drainage. Various responses suggest checking the diameters of hoses and ensuring proper installation of a tee fitting to prevent leaks. Recommendations include arranging the washing machine hose in an inverted U shape and ensuring the siphon is unobstructed. Some participants advise against using a shared drain for both appliances, suggesting separate hoses to avoid potential damage to the dryer. The importance of correct installation of the Aqua Stop valve is also highlighted.
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FAQ

TL;DR: Rotate the inlet Aqua Stop 180°, and route both drain hoses to a wall standpipe; "Use the tee only at the drain pipe in the wall." This stops pump-back into the dryer and seals better on long runs. [Elektroda, Kenworth 18, post #19037489]

Why it matters: Prevents crossflow, odors, and potential dryer damage when sharing a distant drain—especially in stacked LG setups.

Quick Facts

Can I connect an LG F4WV710P1 washer and RC90V9AV3Q dryer to one drain?

Yes—share a single drain by joining both hoses at the wall standpipe, not mid-hose. Install the tee at the wall inlet. Route the washer hose in an inverted U at the standpipe entry. This setup minimizes backflow and leaks during pump-out. [Elektroda, Kenworth 18, post #19037489]

Why does water back up into my dryer hose when the washer drains?

A low, mid-run tee lets the washer pump push water up the other branch. “Separate drain hoses from both devices would solve this problem.” Move the junction to the wall standpipe instead. That change stops forced flow into the dryer hose. [Elektroda, Kenworth 18, post #19037869]

Where should I place the tee or wye to share a drain?

At the wall drain/standpipe entrance. “You should use the tee only at the drain pipe in the wall.” Avoid tees behind the stack or on the floor. Keep both hoses independent until they reach the standpipe. [Elektroda, Kenworth 18, post #19037489]

Do I need to form an inverted U in the washer drain hose?

Yes. Shape the hose into a firm inverted U near the standpipe. This is the arrangement recommended in washing machine manuals. It helps deter siphoning and stabilizes the connection height. [Elektroda, Kenworth 18, post #19037489]

Should I rotate the inlet valve/Aqua Stop 180°?

One expert recommends rotating the angle valve so the mechanical Aqua Stop points vertically down. The goal is reliable leak actuation at the tap. If it currently points sideways, rotate it 180° for a vertical orientation. [Elektroda, Kenworth 18, post #19037489]

Will the mechanical Aqua Stop still work if mounted horizontally?

Yes. Another expert states orientation does not affect operation, so horizontal mounting still works. You can mount it discreetly behind the washer if space is tight. [Elektroda, zhudomel, post #19042469]

Could a clogged siphon be causing retraction or leaks?

Yes. Lint and hair can clog the trap and restrict flow. Inspect the siphon and clear any buildup. A slow or blocked trap increases pressure and encourages backflow through a shared tee. Clean it before changing the hose layout. [Elektroda, stanislaw1954, post #19036528]

What hose diameters should I use for a shared drain?

Match the common section to at least the washer hose diameter. Hoses from the washer and dryer may differ, so use compatible tees or adapters. Undersized junctions increase restriction, noise, and leak risk at clamps. [Elektroda, stanislaw1954, post #19036528]

Is backflow harmful to the dryer?

It can be. “...may have a negative impact on the dryer.” Prevent forced flow into the dryer hose by keeping drains separate until the wall standpipe. That avoids exposing the dryer’s condensate path to wastewater. [Elektroda, Kenworth 18, post #19037869]

How do I stop backflow when sharing one drain?

Use this quick fix:
  1. Move the junction to the wall: install a tee at the standpipe inlet.
  2. Route each appliance’s hose separately to the wall.
  3. Form an inverted U at the standpipe entry to set the proper height. This arrangement prevents crossflow between hoses. [Elektroda, Kenworth 18, post #19037489]

My drain is 3 m away and I can’t move the stack. What’s the clean solution?

Extend the wall drain toward the appliances and terminate behind or beside the washer. Remove the existing siphon if needed and finish at standpipe height. Then connect both hoses at the new wall inlet with a proper tee. This avoids mid-run extensions. [Elektroda, zhudomel, post #19037964]

Does a 3 m drain run increase backflow risk with a low tee?

Longer runs increase hose volume. During pump-out, water can climb into a shared branch before reaching the trap. The original poster saw water rise toward the dryer with a 3 m drain and a low tee. Shift the junction to the wall to stop it. [Elektroda, misiek-puchatek, post #19035981]

My tee connection seeps. How can I fix it quickly?

Reseat the hoses fully on the fittings and tighten quality worm-drive clamps. Recheck that each hose meets the tee at the correct diameter. Re-clamping often stops minor seeping at the dryer branch connection. Avoid over-tightening to prevent hose damage. [Elektroda, misiek-puchatek, post #19036699]

Is it okay to remove the check ball in the siphon?

Don’t rely on internal ball removal to cure backflow. Rework the drain path instead. Remove the siphon, extend the wall drainage toward the washer, and finish at standpipe height. Then join both hoses at that wall inlet with a suitable tee. [Elektroda, zhudomel, post #19037964]

Do I need separate drains for washer and dryer, or can they share?

They can share one standpipe if you join them at the wall. Avoid a mid-run tee. As one expert noted, “separate drain hoses from both devices would solve this problem.” Route each hose independently to the wall junction. [Elektroda, Kenworth 18, post #19037869]
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