To get full pressure you need to pull the wand away from the base. Then remove the wand from the hose becareful not to loose the washer. When the wand is removed look down the wand you will see a plastic part. That plastic part is a flow restrict-er. You need to put a screw in the restrict-er and pull it out. When it is out put wand back on the hose then you will have full water pressure.
SOURCE: low pressure and flow on hot water side of single handle faucet
It could be one of two problems, one simple, one serious.
If you have steel pipes you may be experiencing reduced flow due to corrosion in your pipes. Reduced hot water pressure in the kitchen faucet is usually the first sign since this is the faucet that is most used in the home.
Repiping is a job for a professional. Another symptom you may need a repipe is orange colored or rusty water.
SOURCE: DELTA MODEL 470-WH LOW WATER FLOW AT KITCHEN FAUCET
This could be a couple of things.
If you need a diagram of the faucet with part numbers here is the link:
Delta 470
Hope this helps!
SOURCE: Delta Kitchen Single Faucet 470 suddenly would not give water
Debris in the valve is a fairly common cause for stopping water flow in single lever valves. You can first check the aereator and remove any debris that may be there at the faucet itself. Then you can try to remove the ball at the control lever. You have to be careful and make sure that you do not drop any parts. Especially if this is a recent installation, you may find a large piece of something there.
SOURCE: How do I remove delta 470 kitchen faucet? It won't swivel
If the 470 is typical, there should be two large nylon nuts on the bottom of the faucet tubes that hold the faucet to the sink. First, turn the water off, then open the faucet to drain any pressure. Next, disconnect the feed lines (hot and cold) that connect to the faucet from under the sink (be prepared for some water back flow, so paper towels would be a good idea). After the feed lines are disconnected, you should be able to reach up (usually behind the back of the sink basin) and access the two large nylon nuts (one on the cold and one on the hot). These nuts typically have raised portions so that you can get a grip on them. If you are lucky, you will be able to turn them (lefty loosey, righty tighty) by hand. If not you may have to work for some time with various pliers or other tools getting them to turn. Once you have them off, the faucet will simply lift up from the sink. Installation of another faucet should simply be the reverse procedure.
Good luck.
SOURCE: The pressure in my Delta faucet is suddenly low.
It's the aerator. Unscrew where the water comes out of your faucet; if it doesn't unscrew easily, wrap with a rag and use pliers (as not to scratch). Run your water to see if it flows freely, if so, clean out the aerator or replace (about 6 bucks). good luck
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