The two handle faucet with a side sprayer has been a mainstay of American kitchens for decades. As sink real estate becomes cluttered with other necessary items, there needed to be away to incorporate the sprayer and leave room on the sink top.
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The solution to this was the pull down sprayer. A person pulls the nozzle from the spout and it remains attached to the faucet, giving in effect a sprayer. When not in use, it retracts into the spout, where it is used as normal.
How it Works
A pull down sprayer is essentially a hose attached to the nozzle of a faucet that resides inside the spout and attached to a series of weights under the sink. When the sprayer is pulled down, these weights are lifted up and when the sprayer is released these pull the nozzle back into place. Honestly, while this is in fact what happens, it is slightly more detailed. There are typically guides inside the spout that allow the hose to retract and the nozzle to return to a exact position time and time again. Also the pull down 
sprayer can have adjustments at the nozzle like an aerator and flow control to either increase or decrease the spray pattern. The whole point is to save space on the sink top and make using the faucet more efficient.
Correct Installation
When pull down faucets first came to market, many complained that the sprayer would not fully retract. In most cases, this was found to be a problem that resulted due to poor installation and incorrect placement of the weights. There must be ample room underneath the sink for the weight to extend to their full length. Trashcans, and other objects can impede the weights and therefore it is essential that this be checked and adjusted for when installing the faucet. This can also occur over time when objects get pushed towards the back and can get in the way of the weights. Installation is still easy, it is just that this must be taken into consideration.
Best 3 Hole Pull Down Faucet for the Money
This American Standard 4175.300.075 Colony Style Pull Down Faucet is high arch, 180 degree swing faucet with pull down sprayer is fully ADA compliant. It produces a flow of 2.2 GPM, and the sprayer has adjustable pattern and pause features.
It is single handle and includes the optional cover plate and can easily be installed on a standard three hole sink. The finish and faucet is corrosion resistant and will offer years of great service. So much so, that many users remark on the longevity of the product years later. Also the faucet is easy to install.
Top Rated 2 Hole Pull Down Faucet to Buy
Moen 7185C Brantford Style Pull Down Faucet has been a leading brand of faucets and fixtures for some time and the Brantford style faucet illustrates clearly the grace and design that Moen puts into their products.
This faucet is in a chrome finish and uses Moen’s own REFLEX system to an accurate fit with the return each and every time. Users remark on how beautiful and wonderful the design is and how great it looks in their respective kitchens. This 1.5 GPM faucet can fit two or three hole faucets and is easy to install thanks to Moen’s Hydrolock feature.
Best Single Hole Faucet for the Price
This great looking Pfister F-529-7WHS Wheaton Style Pull Down Faucet is fully ADA complaint and uses a single side handle for precise water control.
It can fit almost any hole configuration from 1 to 4 and comes with a matching soap dispenser.
The traditionally styles, stainless steel finish with all brass interior is great for almost any theme or look.
Users love how easy it is to install and how responsive the pull back is on the pull down nozzle.
Best Faucet to Buy
Kohler K-560-2BZ Bellera Style Pull Down Faucet has been producing plumbing fixtures and supplies since 1883, and this oil brushed bronze finish faucet show the dedication Kohler puts into their fixtures.
This faucet is single handle for precise water control and is fully ADA compliant. It uses a special head to prevent mineral buildup and is super easy to clean.
This 1.5 GPM faucet is loved by users for its ease of installation and high arch, 360 degree rotating spout.
Best Pull Down Faucet on the Market
The Delta Faucet 9158-SW-DST Fuse Style Pull Down Faucet
is a premium faucet with a stainless steel and white finish in a fusion of design. This 1.5 GPM faucet is fully ADA compliant and uses a single handle for water control.
It uses Delta’s own MAGNATITE, technology for a perfect retractable fit, time and time again. It also allows for removal of calcium and lime with a tough of a finger. This high quality faucet is praised by users for the ease of installation and the elegance of the modern fusion design.
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As with any home project, make sure to read and follow all operator manual instructions for a safe and easy installation. Make sure to properly set the weights on all pull down faucets and make sure there is adequate clearance for clear movement. Each of these faucets come with a limited lifetime faucet and finish warranty and would make a great addition to any kitchen.