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I have a Hansgrohe Metro high arc kitchen faucet about 6 years old. The flow is very low. When I check the water pressure before the sprayer it is fine. I've looked at the parts list for the sprayer and there seems to be a check valve in the sprayer but I can't figure out how to get to it.

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Posted on Jan 02, 2017

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SOURCE: kitchen faucet , reduced water flow / pressure

Hi ssam1

I'm Harvey the Master Plumber.

You want to know if you can fix a sudden low volume /pressure delivery problem on an American Standard model AS4205100 H7, one hole / single lever with pullout spray And is it fixable by owner?

Yes and maybe!

All plumbing systems are plauged with debrie buildup. Every time you turn on a faucet the water starts moving and will bring bits of debrie up from the water main or well. Most are small and will pass through to be caught by the screen in the aireator. Sometimes a relatively large piece comes along and dosen't make it through to the screen. It is stuck in the body of the valve.
Fixing takes a little mechanical ability.
First, turn off the water to the faucet in question. Then carefully disasemble paying close attention to the order of disasembly so you can reverse the order when putting back together. As each part is removed inspect it for that troublesome bit. I find that a little bit of wire or a paper clip is helpfull. Carefully reasemble. If the volume is still low then you missed finding that bit. Try again or call in a local pro.

Feel free contact me again!
Please give me a rating here at before you sign off
Thank you,
Harvey your Master Plumber

Posted on Sep 10, 2008

  • 33 Answers

SOURCE: low pressure and flow on hot water side of single handle faucet

It could be one of two problems, one simple, one serious.

  • Easy fix
  1. Turn off hot water angle stop under sink to faucet.
  2. Remove supply line from hot angle stop.
  3. Place end of supply line in a small bucket to catch some water.
  4. Turn on cold water for a couple of seconds and backflush debris from faucet.
  5. Reconnect supply line.
  6. Turn on angle stop and test
  • Complex fix
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.

Posted on Dec 05, 2008

  • 33 Answers


This could be a couple of things.

  1. First remove the aerator from the wand and make sure you have plenty of flow with it off.
  2. If there is flow clean or replace the aerator.
  3. Remove the wand and look between the hose connection and the wand there should be a screen between them. Remove the screen and clean or replace.
  4. Make sure hose is kinking under the sink.
If you need a diagram of the faucet with part numbers here is the link:

Delta 470

Hope this helps!

Posted on Dec 05, 2008

  • 33 Answers

SOURCE: Faucet/sprayer coordination

If you have a Delta faucet your diverter may need to be replaced. The diveter is located under the spout (see diagram)(this is not your faucet but works the same)


Here are the instructions:

  1. Turn off water to faucet.
  2. Remove handle.
  3. Remove top cap.
  4. Turning spout back and forth gently lift and remove.
  5. Remove and replace diverter.
Hope this helps and please remember to rate this!

Posted on Dec 09, 2008

  • 10865 Answers

SOURCE: Greetings! My Kohler kitchen faucet

Begin by shutting off the water to the faucet. Then, on the back of the handle you will find a small button. remove it with a small knife blade and underneath you will see a 1/8" set screw. Use a 1/8" inch allen wrench to remove the set screw. You can then unscrew the bonnet and remove the diverter. Take the diverter to a hardware store or plumbing supply to purchase the appropriate repair kit. goodluck.

Posted on Jan 21, 2009

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Low flow is a debris driven issue. If the flow is lower on the hot or cold side then you will most likely find the debris in the hot or cold supply line leading up to the faucet. If the flow is the same between hot and cold you will find the debris in the faucet between the cartridge and the spout or sprayer. The actions you will need to take to get to the debris will vary depending on model and type of faucet. I would need to identify the faucet before I can give instructions on clearing the debris and restoring the flow of the unit. If you need help in identifying the faucet feel free to contact me at Hansgrohe Technical Services 1-800-334-0455 press 2 for Tech and ask for David.

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It sounds like you have already checked the obvious places at the cartridge and the filter screen at the end of the hose. If you have good flow through the hose with out the sprayer attached I would suggest the blockadge was in the sprayer. If you look into the hand sprayer from the hose connection you will see a yellow ring with a white plastic flap in the middle. This is the first check valve as well as the flow restriction device. This little assembly can be removed [for cleaning] by pushing in on the white plastic part and hooking the yellow ring and simply pulling it straight back and out of the handsprayer. A cork screw or dental pick works well for this. Once removed you will need to hold this little assembly over something other than the sink and unsnap the grey end from the yellow housing. You will most likely find some debris in this little grey end around the spring at the flow restriction device. This is common after a water heater replacement due to the amount of debris stirred up during the flushing process. Once cleaned you will need to reassemble and reinstall the check valve assembly for proper function of the unit. If you need any further help feel free to contact me at Hansgrohe. 1-800-334-0455. Press 2 for tech and ask for David Scarborough. I'll be happy to help.

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This is most likely debris in the aerator, filter screen or check valve in the hand sprayer of the faucet. Try removing the hand sprayer and checking the filter screen at the end of the hose. The try removing the check valve to ensure it is clear of debris. It is the yellow ring with the white plastic flap in the middle. You can simply push in on the white flap and hook the yellow ring with a cork screw. Then pull it straight out. You may want to cover the drain with a dish cloth while doing this to keep small parts from being lost. If you need further help feel free to call me at Hansgrohe 1-800-334-0455. press 2 for tech and ask for David Scarborough.

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I had the same issue with an American Standard faucet that I installed new 6 months ago. The diverter can be the issue if you have a sprayer attachment. Try unscrewing the sprayer head from the hose it's attached to. Now run the water full pressure with the hose pointed into the sink, obviously :~). After running the water for about 1 minute, connect the sprayer head back onto the hose, make certain the flat rubber washer and ring gaskets are seated in their grooves properly, and tighten until you have no water leaking from the sprayer head/hose connection. Now try the water through the faucet. If the problem was a temporary diverter issue, your pressure should be fine now. Good luck

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The design of a hand sprayer is meant to provide a higher pressure spray (the smaller outlet size means greater velocity in the water coming out of the sprayer head). That said, there could be something constricting the water flow in your faucet. If you unscrew the aerator on the end of the faucet do you get better pressure? Is the screen in the aerator clogged with sediment or mineral deposits? If this is the case you may have water requiring periodic cleaning of the aerator.

Hope this helps.



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