This review is specific to the Delta 440-SS-DST Collins Single Handle Kitchen Faucet with Spray in stainless steel finish. After browsing the manufacturers web site to select the style and finish we wanted, we learned more about the Diamond Seal Technology and decided this was a must have feature for us in whatever fixture we would eventually decide upon. Loving the more traditional look and function of this type of kitchen faucet for our double sink, the choices were very limited. A lot of the models for sale now have the retractable sprayer head which didn't appeal to us for our needs. Thankfully Delta hasn't completely abandoned this style of faucet. We received the faucet assembly quickly and nicely packaged. Delta even had a number of the components wrapped separately in the box to protect the finish, a nice touch. This unit was installed in a residential sink and nearly everything went together well. Nearly. And this is the only thing that I've withheld a single star on. If you decide to make use of the sprayer portion of the unit when you're installing, the manual (of which mine is Revision D) states to `insert the diverter hose end into diverter housing until seated.' This connection utilizes 3 o-rings for sealing purposes. I thought it strange there was no mention to use plumbers silicone grease on these o-rings. So, I followed the instructions and made the connection `dry'. It leaked at that connection. After turning the water supply back off, putting a pan under the line and disconnecting the above mentioned connection, I dried off the o-ring area well. This time I applied the plumbers silicone grease to the o-rings and made the connection again. No leak. Yay! I need to email the company and make them aware of this, if they don't perhaps already know it. I suspect a `Revision E' manual that mentions applying the grease along with the addition of a grease capsule with the hardware kit would prevent others from having an issue and perhaps prevent some unnecessary returns. We've been using the faucet for just over a month now and love it. As has been mentioned by a few others here, some of the time there is a noise from the sprayer diverter area when you run the faucet (it doesn't happen if you're running the sprayer). It has no effect at all on the performance of this unit at all. It's just a tiny noise. Perhaps not all units will have this happen. It doesn't bother us and I almost forgot to mention it until I looked at some other reviews here. Our unit came with the 1.8 gpm (gallon per minute) aerator which suits most of our needs just fine. If you need more flow, for filling a water can as an example, you may want to order the 2.2 gpm aerator which is part number RP18508. There is also a 1.5 gpm aerator available if you're looking to further reduce water usage. This unit should do fine being installed in any typical residential sink. If you are looking to install it in a more commercial or heavy usage situation (say as a shop sink off of a garage), there is a Delta part that will help you achieve that. But, this is where things can get a bit weird due to Delta having a single instruction manual that covers multiple versions of its faucets. Oh, and to add to it? There are -many- revisions of that manual, so be certain to read the next 2 paragraphs carefully lest you make an oops and order the wrong parts. If you have a Delta 440 series faucet, which the Delta website refers to as a `4-hole 8" installation', you will need the `Delta Stabilization Plate, Model # RP37490 (I pulled that specific name and model information directly from the Delta website. Amazon.com also carries this part for sale, under the same model number, but for some reason they refer to it as a `Victorian Stabilization Plate'. Thanks to Jenkins for pointing this oddity out. An interesting point of note is that this part is not listed at all in the revision of the installation/parts manuals that we received with our faucet. But if you are installing any of the `single hole or 2-hole' series of the Delta product mentioned in the same installation manual and you wish to stiffen the mounting point for a firmer mount, then you will want the `Delta Stud Reinforcement Kit, Model # RP63792' which Amazon.com also carries. This part is listed in our installation/parts manuals we received with our faucet, even though it doesn't fit the 440 model faucet. Very odd! All in all, if you like this style of faucet and sprayer, I think you'll be happy if you bought this model. In a final note, it is now March 29, 2017 and this faucet is still working perfect! Zero problems at all.
