Turn off the water to the faucet. Locate the shutoff valves for the hot and cold water supply within the cabinet underneath the sink. Alternatively, turn the water off at the main shutoff valve.
Find the small hose weight hanging from the chrome pullout hose below the sink. Some weights are comprised of plastic and are looped through the pull-out hose; other weights are brackets screwed to the hose. If your weight is screwed on, remove the weight, using a flathead screwdriver. If the weight is a plastic loop, leave the weight alone for now.
Turn on the faucet and allow any residual water in the pipes to drain into the sink. Pull out the faucet spray wand from the spout and unscrew it from the chrome pullout hose. Be careful not to drop the small washer inside the nozzle of the hose end. Unscrew a very tight connection, using the adjustable wrench. Wrap a layer of electrical tape around the jaws of the wrench to avoid damaging the screw.
Pull a few inches of the pullout hose through the spout into the sink to prevent the hose from dropping into the cabinet.
Go beneath the sink. Loop the plastic hose weight onto the hose, if necessary. Remove the hose plug. Reattach the pullout hose to the flexible, water-supply faucet hose. Tighten the connection until it is snug but not overly tight, using the adjustable wrench. Reattach the hose weight bracket with the screwdriver, if necessary.
Turn on the water supply.