Typically leaks under the counter occur upon installation due to one of two factors.
Delta lewiston kitchen faucet leaking.
Also be sure to remove the spring.
How to fix a leaky delta two handled kitchen faucet 1.
Since the water travels through the hose and not the spout itself a leak from the base of the spout would be very unlikely.
Turn off the water to the faucet and open both valves to relieve water pressure.
This worked about 3 months then the leak returned.
With 18 grains hardness calcium the lewiston faucet worked well for 6 months.
In the delta faucet customer service center get warranty information register your product find repair parts and instructions or contact a specialist.
All in all it takes about ten minutes to complete the repair and this is all you need.
Shut off water supply.
These are the washers that keep the water from leaking when the faucet is off.
In the bottom of the socket you should see two black rubber pieces.
Cover drain opening so parts won t fall into it.
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Pop the cap off the top of one of the handles with a flat head screwdriver.
Let s begin by troubleshooting with the hot valve.
If you have knob handles pry off the handle button.
Replace the hose if it is damaged or leaking.
These can be removed by gently prying them out with a small flat tipped screwdriver.
If this occurs check the connection of the hose to the spray wand.
With quick snap connections newer delta widespread faucets feature quick snap installation.
Unscrew the nut that holds the valve in.
If you have lever handles loosen the set screw with an allen wrench and remove the handle.
Then it wouldn t shut off leaking variably thru the spout.
It is extremely rare for a faucet to develop a leak under the counter.
Unfortunately though the culprit is most likely the faucet s cartridge which you would need to either order online or go get at the store.
I took it apart cleaned it and a month later it did the same thing.
If you have quick snap connections and experience leaking at the connection points quick snap may not have been properly installed.
If this connection is secure and not leaking then check the hose for damage.