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Grohe 23430?
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So I dug a little deeper and found a parts supply website I asked the following questions regarding the difference between the green and the yellow quick coupling to a Grohe part supplier: Is there a difference between the Grohe Yellow Quick Coupling (#46 138) and the Grohe Green Quick Coupling (#46 315). That is, are they interchangeable? Or is there a difference in the amount of water they allow to flow through them? Or is it only that the green is a newer quick coupling redesigned to fix a design flaw with the yellow coupling (which is notorious for breaking in 5 to 6 years)?
The response I got was the following: "Thank you for your question! The Grohe 46 138 is the older version of the Grohe Green Quick Coupling (46 315). These are interchangeable, so you can use either one. Noting that you are aware of a particular design flaw on the 46 138, I would advise using the 46 315 just to make sure you are getting the newest available part."
I actually bought both parts, and the yellow is slightly longer (which does not affect the functionality of the connector from anything I can detect, but that could be what causes it to be weaker).
So a long story short, I purchased the green quick coupling (which costs a few dollars more) and installed it. It installed easily and I have had no issues with it leaking and all seems to be working fine with it. I cannot say whether it is a better part yet, but I am betting that the shorter design has made is structurally more sound and I am hoping that it will not fail as quickly as the yellow coupling did.
Regardless of the above, given a part like this that is subject to constant movement over the years, I would have expected Grohe to make it out of more lasting material (i.e., metal) that would not break during the faucets normal life span. It is not the cost of the faucet or the replacement part that is the issue but the damage to my cabinet and flooring from the water that built up and seeped through the floor that is the bigger issue. Grohe should be embarrassed by this, as it does not live up to the expected standards for which I believed Grohe was manufactured.
In the future, if I purchase another Grohe faucet, I will look to see what parts are plastic and if they still have this quick coupling made of a material that will not last then I will move on to a better faucet. It is not worth risking the thousands of dollars in dammage that can easily occur from a faucet that pours water into you cabinets.


You have to go under the sink to replace it because it is on the end of the hose where it connects to the body of the faucet, not up at the handle end. Once you get under there and find it, it takes about 30 seconds to replace it.
It is kind of irritating that it costs what it costs since it is just a piece of plastic tubing with one threaded end and one push/pull snap connector on the other. But it saved me from years of frustration with a ridiculously low water flow.


I called GROHE and they said get the Yellow to replace the original red one. GROHE said that they use the Yellow for all now Yellow 46 138.
This actually increased the water flow. I used silicone (non hardening) on the O ring and cleaned the male connector to insure a good seal. Just use a rag on the quick connect to get a good seal. The say on PVC fittings never use over 4 wraps of Teflon tape or it cracks the plastic fitting. I just used silicone non hardening to keep the O ring safe and last longer.
GROHE said not to replace the flex hose. It turned out my hose leaked (a drip) that wet the quick connect.
I ordered a OEM GROHE hose because my old hose lasted from 14 years. Just buy original, you can’t afford a leak.
So if you replace the hose replace the quick connect or visa versus.
If your faucet has low flow it probably isn’t the faucet valve. The check valve in the quick connect gets debris. Just clean the quick connect. I has some plastic debris in mine.
It’s not hard to change the quick connect and hose. Grohe has videos on YouTube.
This vendor on Amazon had quick shipping,


The quick coupling part (1.75 liter/min) that comes installed on faucet directly from factory is so restrictive of water flow that we couldn't even get the spray to stay on. Apparently Grohe ships faucets to the U.S. that meet some sort of flow restriction standard. I read one place that the standard is called "California Green", which I can only assumes comes from the droughts CA has been experiencing in recent times.
In any event the Groho 46 138 000 Quick Coupling part has no flow restriction. So now our faucet works perfectly.
Only drawback is the part is priced ridiculously high. $40+ dollars for a small plastic part is absurd. The term that comes to mind is price gouging. Having said that, it works perfectly and completely solved our low water pressure problem.




To remove the broken coupling, place a basin of some sort under the sink to catch water. TURN OFF YOUR WATER VALVES UNDER THE SINK. Reach up to the coupling with both hands, hold the coupling with one hand and pull down on the colored portion with the other. This will allow the coupling to be released from metal pipe. Carefully pull the coupling away from the pipe while staying away from natural flow of water. Allow the hose and pipe to drain out into the catch basin. Unscrew the black end from the hose and dry the hose threads. If the teflon tape is eroded, remove the old one and add a new one. Teflon tape is used on many screw in joints and is easily purchased at a hardware store. Screw on the coupling, but do not over-tighten. What does that mean? It needs to be secure enough to not leak, but not so tight that it's as far as you can get it. Hand-tightening is fine. There's no need for a wrench unless you have hand strength problems. Re-attach colored end to the pipe by holding the coupling with one hand, while pulling the colored portion down as you push it onto the metal pipe. Push all the way up and release the colored portion. You should hear/feel it snap in place. Tug down on it to make sure it's secure. Voila! You are done. Remember to turn you water back on. Keep the basin in place until you've tested the installation fully. Watch for leaks. Turn on and off several times, running the water for long and short periods. Any leaks are probably from the black end not being tight enough. If the colored end is not secure, it will pop off while you are running the water.
Last bit of advice, it's worth paying extra for the overnight shipping, since you are saving a ton by not calling a plumber. I first checked to see if I could find the part at a local brick and mortar supplier, but had no luck. I doubt a plumber could get it for you faster unless the company carries it on their own.

Be sure to replace the o-ring as well (Grohe 01224000) to prevent any leaks.







The yellow end connects and disconnects with a quick couple mechanism. That is where my leak was. You push the yellow sleeve down (don't try to unscrew it like I did) and the whole hose comes off the faucet end...there is just a bubble-expansion on the end of the faucet that this connects to. The other end unscrews and the hose disconnects so you can put on the new coupling.
I now have a spare coupling and a spare sprayer underneath my sink so when this happens again, I'm ready and can fix the problem immediately.
Fast shipping - item arrived in one day for $3.99. THANKS Amazon for saving me a bundle.


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