I have a Delta Signature Series WF-440 faucet with a side sprayer that's about 5-6 years old. Developed a leak under the sink, and found out it was coming from where the side sprayer attached to the sink. It is a compression type fitting, and had come apart. I discovered that I could not buy a replacement in the local big box stores, so called Delta, and they sent a replacement. I took the new one, snapped it back onto the faucet under the sink, turned the water back on, and I STILL have a leak. I'm frustrated and baffled. Thinking I should remove the faucet from the counter so I can see the fitting above the sink. Any thoughts or ideas? We have been without a kitchen sink for almost 2 weeks, and my wife is about to lose it. Trying to avoid replacing it all together.
Thanks

Attaching the sprayer hose to the faucet is quite a job. Usually, there is no room for proper tools under the sink to tighten up the nut. Yes, it would be lot easier to do this connection above the sink. Please, double check your installation first...

Taking the sink off, especially if you have all those little "clips" on underneath can take some time. If you had an adjustable basin wrench, it might help you get a tighter connection. I would try that first if you can pick one up.

Attaching the sprayer hose to the faucet is quite a job. Usually, there is no room for proper tools under the sink to tighten up the nut. Yes, it would be lot easier to do this connection above the sink. Please, double check your installation first ...

That's the problem - this hose had no nut - there is a snap-on type fitting on the end of the hose. It feels firm, but obviously something is wrong. I'm thinking that on the connection on the hose end there may have been a washer that could have come off??

Taking the sink off, especially if you have all those little "clips" on underneath can take some time. If you had an adjustable basin wrench, it might help you get a tighter connection. I would try that first if you can pick one up.

I do have a basin wrench, thanks. Although I am dreading trying to do that since the bolts are in a tough spot up under the sink and other plumbing - not an easy spot to get to.

Steve: I am confused. Is it Snap On connection or Compression Nut Connection ?

Sorry - snap-on. It has 2 plastic parts on the end of the hose held together with metal clips. It pushes on to the end of the fitting under the faucet.

Was there a little black O ring?

Ok, it is Quick Connect attachment. This usually happens when you lose the retainer clip or O-ring on the quick connect piece. These are tiny parts and are easy to lose.

Take the Quick Connect piece out one more time and make sure they are present. If not, you will need to either look for them on the bottom of your cabinet or call Delta for new disconnect. Once you get it, handle it with utmost care . Sometimes manufacturer puts clear tape over the fitting so these parts won't get lost during transport.

Yes, there should be small O-ring. That actually makes the seal.

Once you take it out, can you by any chance take a clear photo of the Quick Connect so we know exactly what we are talking about ?

Also, here is contact info on Delta:

If you need immediate assistance, call the Delta Help Line at 1‑800‑345‑DELTA (3358). The Delta Help Line is available between 7 a.m. and 9 p.m. (CST), Monday through Saturday.

First of all, I am at work now - can't take any pictures to send until I'm home over the weekend. Funny that you should mention a small O-Ring. I cleared out under the sink until I could get it all repaired, and there is one on the floor inside the cabinet that I found after I pulled the old one off- thought to save it. Now on the new one, I didn't notice anything loose with it. Does that O-ring belong inside the hose connection? Or on the male sink connection?

There may be a small indent on the stem part
That you connect the hose to. (male) You need the o ring to make a seal as Milo stated. When you connect that snap on, make sure you press it on good. You may or may not hear a "click". Milo made a point above stating that you may have not seen this part on your new packaging because of how it's package.
Carefully look. It may even be on your new connection, but just not on properly.
If your o ring is missing, or damaged, you will get a leak at this area. Milo will most likely keep you going. (smile) Good luck Steve.

I'll do that. You've both been very helpful. I know enough to be dangerous, but don't claim to be the handiest person on the block. I am dreading having to try to remove the faucet, and if this works I will be very grateful! (not to mention saving my marriage!)

Ahem, she doesn't like doing dishes and working in the bathroom while preparing meals eh? (grin)

Hi, sorry about the timeliness of my response. I have been in the field all day today...

I asked for photo of the quick connect so I can ID what type of QC you have. Usually, there is a black o-ring that is supposed to be inside the coupling.

Well, I finally looked at this again this morning - took it back off to see what's going on. Verified that there is indeed a small black o-ring inside, and there is also a plastic ring/washer. This plastic piece was mangled - apparently in my several attempts to seat the coupling.It, and the black o-ring were loose- out of place in the hose. I don't know for sure if it is a functional part, or if it was used in shipping to keep the o-ring in. I believe it is functional, since I tried re-attaching the hose without it, and still had a leak. . So that looks like it was the cause of my problems. Luckily my wife called Delta again yesterday and talked them into sending another replacement hose. Will be a couple of more days before it arrives, but still better than taking the sink apart. I appreciate the helpful answer from the both of you - helped me to focus on what to look for.

The REST OF THE STORY:
I got the 2nd replacement hose, which also didn't fit right or seat. I called Delta and they wanted me to send it back to then for inspection, and then they'd make a determination.
(this was over the weekend). On Monday,my wife called them and they finally agreed to send a new faucet. BUT - they couldn't promise when we would have it - said sometime within 1 to 2 weeks. Bear in mind that we are pver 4 weeks with no use of water in the kitchen. SO - we bit the bullet, bought a new Price Pfister faucet, and had a friend help to install it - we're back in business. After the faucet was out, I could finally see what my problem was all along. The faucet itself is no longer made by Delta, and although they still have faucets with the same snap-on sprayer, they've changed the design somehow.
The replacement hoses that they sent were too small to fit all the way on the hose fitting and would have NEVER worked no matter what.
By the way - the Delta replacement faucet arrived the day after I put in the new one, and it was sent minus the spray hose.
Bottom line - I will not purchase another Delta product based on their poor customer service and lack of knowledge about their own products.