Questions tagged [backflow-preventer]

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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....
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29 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 ...
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2 votes
1 answer
67 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 ...
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2 votes
1 answer
37 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 ...
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1 answer
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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 ...
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46 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 ...
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1 vote
1 answer
94 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 ...
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  • 111
-1 votes
4 answers
137 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. ...
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1 answer
2k 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 ...
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2 votes
1 answer
756 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 ...
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-1 votes
1 answer
107 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 ...
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-2 votes
1 answer
290 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 ...
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0 votes
1 answer
461 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 ...
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1 answer
144 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 ...
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  • 1,166
1 vote
2 answers
281 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 ...
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  • 111
1 vote
1 answer
225 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
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98 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,...
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0 answers
25 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 ...
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0 votes
1 answer
799 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 ...
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0 votes
1 answer
1k 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 ...
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3 votes
1 answer
236 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 ...
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  • 510
1 vote
0 answers
508 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 ...
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  • 133
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 ...
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  • 1
0 votes
0 answers
336 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 ...
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