Questions tagged [backflow-preventer]
The backflow-preventer tag has no usage guidance.
33
questions
6
votes
2
answers
5k
views
Water shut off valve and backflow preventer
I'm a new member here. I'm here to learn how to do DIY plumbing work.
How does my home's main water supply valve, backflow preventer, and Potter switch work?
Image 1. The Main water line enters the ...
- 61
3
votes
2
answers
845
views
backflow-preventer valve: "shall provide protection where a potential health hazard does not exist": can it be used in a house?
Ideal for use where Lead-Free valves are required. Designed
for installation on potable water lines to protect against both
backsiphonage and backpressure of polluted water into the
potable water ...
- 1,972
3
votes
1
answer
320
views
Why did my febco backflow preventer fail?
I'm working as a handyman for a non-profit, and they have an in-ground irrigation system that has been off for a while because "there was a geyser."
I successfully determined that the geyser was ...
- 506
2
votes
1
answer
441
views
Do individual irrigation system branch pipes need backflow preventers?
I have an inground sprinkler system with 3 zones.
The water line coming up from the basement is going to the valves and has a Wilkins backflow preventer on it. I am adding 2 new valves/zones for drip ...
- 21
2
votes
2
answers
1k
views
Do I need a backflow preventer before my yard hydrant
I have a yard hydrant installed in my front yard. It is connected directly to the water supply from the city. The yard hydrant has a drain at the bottom that allows water to drain from the hydrant ...
- 14.3k
2
votes
1
answer
303
views
Can I eliminate irrigation vacuum breaker after installing upstream RPZ?
I have an atmospheric vacuum breaker on the feed from my meter to my lawn irrigation system. I am going to install a water-powered backup sump pump in the basement. (This uses city water pressure ...
- 43.4k
2
votes
1
answer
2k
views
I know there is a pressure vacuum breaker here, but what is the rest?
First, a labeled picture of the situation:
There are three ends, two in the ground and one in the house. How can I figure out which way the water is flowing?
There are four labeled valves (and one ...
- 235
2
votes
0
answers
580
views
Backflow prevention fixture on my sprinkler system has started leaking -- is teflon tape the appropriate fix?
The backflow valve on my irrigation system has developed a minor leak at the threads I am pointing to. It's outside and not super fast, so not super urgent, but I would like to get it fixed eventually....
- 1,807
1
vote
1
answer
530
views
Can I seal a crack in a Zurn Wilkins 375 RP backflow preventer?
I noticed our backflow preventer was leaking, so I pulled out the assembly to see what the issue is and it looks like a decent-sized crack in the plastic above the relief valve. Is this something I ...
- 111
1
vote
1
answer
165
views
Is it a problem if my back flow preventer pit is filling with water?
I bought his home in MN and moved in back in February. This is my first home and it was remodeled by a flipper. It’s now spring and has rained quite a bit the last few weeks. Last week, I discovered ...
- 11
1
vote
1
answer
458
views
Remove leaky backflow preventer
I have a leaky backflow preventer I'm trying to remove. It's been on for most of 10 years, and we've got pretty hard water. I've drilled out the set screw:
I have some channel locks that I can use to ...
- 185
1
vote
2
answers
2k
views
Is my irrigation system winterized properly?
I had a sprinkler specialist come over today to winterize my sprinkler system. I live in northwestern oregon (portland) and I'm trying to figure out if he properly winterized the system or if I need ...
- 111
1
vote
1
answer
1k
views
Can this water valve be replaced as a separate component?
Crack in bottom part of backflow preventer can you just replace this part or do you have to buy entire unit??
Thanks,
Eileen
- 11
1
vote
0
answers
1k
views
Reinstalling backflow preventer. Do I need glue or grease or anything else
I am going to reattach my backflow preventer today (save 125 vs calling company). Do I need to apply any plumber grease or pipe glue to the pvc portion? Here are some pics of the preventer and place ...
- 133
0
votes
1
answer
617
views
Should I leave main water off after my back flow preventer broke?
Due to unusually cold temps my back flow preventer (Febco 765-1) has frozen and broken. I was under the impression that my back flow preventer in my backyard was only relevant to my sprinkler system, ...
- 3
0
votes
2
answers
8k
views
Why is my sprinkler system backflow leaking after being winterized?
After having my sprinkler system winterized, I noticed water leaking from the spigot. I thought it would stop once all the extra water came out but it is still leaking after 1 week.
I turned the ...
- 9
0
votes
1
answer
1k
views
New vacuum breaker drips after shutting off the hose and releasing water off the hose
In my garage, I have a faucet with anti-siphon valve. I believe they call it vacuum breaker. Since it was leaking when I turn on the faucet, I replaced it. It stopped leaking with new valve but when I ...
- 1
0
votes
1
answer
149
views
Why is my lawn sprinkler backflow preventer failing?
I have 14 zones which work fine except for zone 6. When it starts water starts coming out of backflow preventer. I already changed the valve parts and solenoid. Is there any thing else I can check?
0
votes
1
answer
1k
views
Backflow preventer spewing water
I have a lf009mq2t watts backflow preventer which starts spewing water from its center nozzle anytime any of my three irrigation lines stops running (or if I run a hose while its valve is off). I can ...
- 109
0
votes
1
answer
1k
views
Is a back flow valve needed to attach a washing machine?
I want to attach a washing machine to my apartment's water supply.
The washing machine is simple and has one inlet and no internal heater. The apartment has both hot and cold water.
I plan to attach ...
- 231
0
votes
1
answer
335
views
How to connect to black underground sprinker pipe
My backflow prevention device failed over the winter (nice large split, as you can see). I checked with the local city, and they won't let me replace like with like, so I'm going to install a Wilkins ...
- 1,513
0
votes
1
answer
2k
views
How to prevent the washing machine outlet from backflowing to other devices
I have a washing machine that drains into a sink standpipe.
I also have a clothes dryer that drains to sewage or greywater plumbing.
When I connect the two via a T-piece with the dryer inlet at the ...
- 101
0
votes
2
answers
1k
views
Sprinkler System Low Pressure
Is there a way to determine if my sprinkler system has a pressure regulator installed?
My neighbor and I both built our houses with the same builder at the same time, but had different landscaping ...
- 1
0
votes
0
answers
88
views
How to replace the backflow preventer in an old house?
My house is about 30 years old. The backflow preventer in my front yard looks old as well. One time, a person who did our lawn carelessly cut the 2 pipes (where two red arrows point) of the backflow ...
- 572
0
votes
0
answers
766
views
One of multiple zones calls for heat, but all return lines get hot
We just installed new gas combi boiler (Lochinvar NKC199N), it is working but there is one issue that I don't quite understand.
We have 4 zones (4 different circulation pumps, 4 thermostats), when ...
- 31
0
votes
0
answers
257
views
vacuum breaker on hose bib (spigot)
We have a backflow preventor on the water spigot in the garage. A water hose is attached that has a sprayer on the end. Every time we turn the water off from the hose and even with the sprayer left ...
- 1
0
votes
0
answers
262
views
Irrigation system: Backflow Preventer -> Master Valve vs Master Valve -> Backflow Preventer
I am in the process of designing my irrigation system, and I saw many people install the backflow preventer (reduced pressure zone device) first and then connect to an automatic master valve.
However,...
- 101
0
votes
0
answers
35
views
access to backflow preventer assembly
My backflow preventer assembly access is in my basement and its right below the proposed vanity space in our proposed basement bathroom.(we have planned a 48 inch vanity , but if i cut down to a 36 ...
- 21
0
votes
1
answer
3k
views
What type of Piping for Reduced Pressure Backflow Preventor for Irrigation System
Looking into installing a above ground reduced pressure backflow preventor for my irrigation system. Looking at many examples and videos online, I saw different types of piping from PVC, Copper and ...
- 3
0
votes
0
answers
531
views
Is my vacuum breaker working properly?
I am in a newly rented house around 1 week and I don't know a thing about plumbing (not yet and I love projects for DIY).
So my question is regarding this: I find this attached to the outdoor pipe ...
- 1
-1
votes
4
answers
683
views
How to properly install irrigation system/garden faucet
I want to install an above ground irrigation system for our flowers (large flower farm). The part I am having trouble with is how to properly connect to the main water supply without having backflow. ...
- 77
-1
votes
1
answer
522
views
How to replace this old backflow preventer with new one
I want to replace this old broken Pressure Vacuum Breaker Valve with new one. Problem is that all the new ones at HomeDepot and Lowes have outflow on the left side. Can someone show me with a sketch ...
- 29
-2
votes
2
answers
981
views
Dishwasher water line not providing hot water
Have an odd situation that started a week or so ago. The dishwasher was running to completion and dishes were either still dirtyish or the dishwasher pod was not dissolved and the dishes basically ...
