Grohe 46138000 1/2 in. Quick Coupling, one-size

This solved the problem of a leaking connection quickly and easily (if you don't count the difficulty of having to crawl to the back of the kitchen sink cabinet at my age...) It only took a few moments and saved me the cost of having a repairman diagnose and fix my leaking faucet.

This was a perfect fit and easy (as DIY plumbing goes) to install. There are no instructions that come with the item, but I read the other reviews and googled it to figure out how to install it. Simply put, the black end is a screw in joint. The yellow (or whatever color) end is a pull-down release/lock.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.

Real simple tool-free install. Only challenge is getting access to coupling location on faucet after the faucet is installed. The coupling is located behind sink directly below counter top.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.

Couldn't believe this part failed on the faucet. Thankfully this was a value and easy install compared to a replacement faucet. Cost was about 1/3 the amount from the specialty store and arrived the next day! woo hoo

My wife & I bought a Grohe 30306DC1 Euro Smart faucet because our old kitchen sink faucet was leaky.It is a beautiful faucet that produces a water stream that is actually pleasing to the eye. The only problem is that it contains a water pressure Limiter/Regulator that reduces water flow to 1.75 GPM. It took forever to fill a pan or something larger than a glass. So I then purchased a "Chinese" Limiter/Regulator from Amazon that was only $20, but its mechanical tolerance was poor, as it was hard to Connect/Disconnect causing it to leak! Finally, I "bit the bullet" and purchased a Grohe "46138000 1/2 in. Quick Coupling" (from Amazon) for $40 (ouch), but it installed easily and works great. Maybe the best faucet we have!

used on my sink and it worked great....no leaks....no problems

Perfect replacement product

I have prime and the two day shipping is just awesome. My sink started leaking on Saturday while I was canning. What a pain. I called two plumbers who quoted amazingly high weekend prices and long shipping times for parts (am I in the wrong profession?). I thought long and hard and while on Amazon, searched for my Grohe faucet model and found that Amazon sells this part. I ordered this and a new sprayer... which was clogged with hard water deposits. Ended up installing them both myself for under $125 in approximately 30 minutes. WOW. That was less than half of the lowest plumbing quote I received - and their quotes did not include parts. You could probably install them faster if you knew what you were doing!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.