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TOPIC: Low water pressure

Low water pressure 1 week 6 days ago #1

  • Ken B
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  • Redwood/2017/3901WB
Just purchased a new 2017 (dealer made a deal i couldn't pass up to more it off the lot) Redwood 3901WB model and there is low water pressure when connected at parks. Though maybe it was the park pressure but just connected at home which has great pressure and no real improvement. Though maybe inline water filter bad - opened it and it appears to be good an clean. Will they go bad from just sitting without water flow? Trailer was on dealers lot for 18 months or so. No open drains leaking anywhere. Shower head does not work well due to lack of pressure. Using same hose and pressure regulator i used on the last trailer which had no issues with pressure.

Any ideas on why I might not have good pressure?

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Low water pressure 1 week 6 days ago #2


If you're using one of these, try without it, unless you have 100 psi+ at your house faucet. These types of so called regulators restrict the flow to reduce the pressure.
Try with the onboard pump from the fresh water tank, if still very weak you may have kinked line somewhere.
Replace the POS factory shower head with an Oxygenics!
Before using this new rv too much I'd be sanitizing the water lines & fresh water tank, replace the onboard filter cartridge, rinse the water heater thoroughly, it's been sitting around for a year & half, who knows how long water has been in it.
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Travelin' Texans
Full timers since 2008
2013 FB Black & Tan (FOR SALE)
2013 GMC Denali 3500 DRW
Last Edit: by Danny and Linda.

Low water pressure 1 week 6 days ago #3

What happens with the pressure throughout if you fill the fresh water tank with water and run the water pump?

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Ken & Gizzi
Ford 2015 F350 DRW
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Low water pressure 1 week 6 days ago #4

By the time you take a 1/2" Pex line and insert multiple fittings, you're lucky to have a 1/8" line by the time it gets to the sink. The dishwasher water pressure is pathetic. I prefer to wash dishes by hand.

If and when I get time, I'll be re-plumbing the expensive RV and installing a manifold like the DRV has. I'll run independent lines to outlets with shut offs. I'll use fitting that go on the outside of the pipe so that pipe sizing won't be reduced.

The current fittings insert into the Pex line and then a ring is crimped on. I think if they could find a way to fit a fitting inside a fitting, they would try it to save $0.02.

I've got 70 lbs of pressure coming to the RV. I can hold my hand over the faucet and shut it off by hand pressure. For now, we live with it.

Sorry to hear about your problem...Like Danny said, remove any water pressure reducers. I don't think you'll ever have a problem except at where the hose connects to the RV. That has already broke out too. Plastic...I'll be replacing with BRASS for $2 more.

One way to look at it...You're making a go green effort by reducing water usage.

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Low water pressure 1 week 6 days ago #5

  • Joe Dombrowski
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  • Redwood/2016/38RL
I removed my in-house inline filter cartridge and that increased my pressure. I also removed all the screens that are on the ends of the faucets and cleaned them of debris. I took the shower head off and removed the water regulator that is built into the shower head ( small black plastic )...

My pressure is better now

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Low water pressure 1 week 6 days ago #6

  • Ken B
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  • Redwood/2017/3901WB
Thanks everyone.

- I did clean the shower head. One of the small three holes was plugged and that made it better. Also checked all the other faucet filter ends.
- I will try without the pressure regulator on it.
- I do plan on flushing everything good
- will take that little water regulator out of the shower head also or I may just go by a better one like you said.

Thanks all.

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Low water pressure 1 week 6 days ago #7

  • Ken B
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  • Redwood/2017/3901WB
Anyone know what filter number I need to replace the inline filter. I has the all blue, not clear, outer shell and is 10" long. Only markings on it Pentek on the outer shell and the number 292 on the filter end itself. Can't find anything online that matches.

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Low water pressure 1 week 6 days ago #8

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  • Redwood/2017/3901WB
Removed the inline pressure regulator (type you show here) and wow what a difference. I have around 70 lbs of pressure at the house. Don't like not having some regulator so I just ordered an adjustable one that does not reduce flow which many comments indicate is the case. go flow even when regulated down to under 50 lbs of pressure. Will let you know how things are once I get it and try it out.

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Low water pressure 1 week 6 days ago #9

kenstrucks wrote: Removed the inline pressure regulator (type you show here) and wow what a difference. I have around 70 lbs of pressure at the house. Don't like not having some regulator so I just ordered an adjustable one that does not reduce flow which many comments indicate is the case. go flow even when regulated down to under 50 lbs of pressure. Will let you know how things are once I get it and try it out.

My adjustable regulator came preset at 55 psi which is good pressure if the faucet your connected to is that high.
The 10" filter cartridge is a very common replacement at Wal-Mart or HD/Lowes. I usually get the 2 pack at Wal-Mart for about $10-12. They have ones for sediment or charcoal for improved taste.

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Travelin' Texans
Full timers since 2008
2013 FB Black & Tan (FOR SALE)
2013 GMC Denali 3500 DRW
Last Edit: by Danny and Linda.

Low water pressure 13 hours 43 minutes ago #10

I replaced my coach water filter with this one I found on Amazon. There are lots of cartridge choices though for this Pentek filter housing.

www.amazon.com/Pentek-ChlorPlus-Carbon-F...1%2F2%22%2C+1+Micron

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Low water pressure 10 hours 1 minute ago #11

Use the right filter for your conditions. They are different for a reason. Some separate particulates. Some chemicals. Some are just for taste. Some are combinations. Research your filter choices. Some will restrict your water flow to a trickle or not at all. And make sure it is installed correctly. That can also shut off your water.

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