11 votes

Water shut off valve and backflow preventer

You want the green valve for normal water shutoff purposes If you're just seeking to shut off the household (domestic) water to work on the plumbing, you want the green valve, since that will shut off ...
ThreePhaseEel's user avatar
8 votes
Accepted

backflow-preventer valve: "shall provide protection where a potential health hazard does not exist": can it be used in a house?

Levels of hazard The US plumbing codes call out different backflow preventers for different applications based on the level of risk involved. Your dual check valve is intended for lower-hazard ...
ThreePhaseEel's user avatar
5 votes

Water shut off valve and backflow preventer

Never heard of a "Potter switch" but I would guess you have a fire sprinkler system, given the "before the meter" and red paint. Also the much larger diameter line for that purpose ...
Ecnerwal's user avatar
  • 210k
4 votes

Do individual irrigation system branch pipes need backflow preventers?

The instructions probably state the need for backflow prevention assuming there is none existing. ( probably legally motivated) If you have backflow prevention on the main line to the system manifold ...
RMDman's user avatar
  • 27k
4 votes

Can I seal a crack in a Zurn Wilkins 375 RP backflow preventer?

I would not expect success attempting to glue or seal that. Apart from the general difficulty of "plastic of unknown type" repair, it's usually the case that when a plastic item cracks one ...
Ecnerwal's user avatar
  • 210k
4 votes

backflow-preventer valve: "shall provide protection where a potential health hazard does not exist": can it be used in a house?

Well, anything can be a potential health hazard, including unpolluted dihydrogen monoxide. I suspect that this language is trying to say is: This valve prevents normal usage from backing up into the ...
manassehkatz-Moving 2 Codidact's user avatar
3 votes
Accepted

Should I leave main water off after my back flow preventer broke?

Turning off the valve that supplies the water to the backflow preventer isolates the water going into your home. You're safe. The BFP when functioning properly allows water to be fed to the sprinkler ...
RMDman's user avatar
  • 27k
2 votes
Accepted

Remove leaky backflow preventer

When removing threaded plumbing you need to use two wrenches. One to hold and one to turn. Place the holding wrench as close to the wall as you can to prevent pipe bending. If you have to, remove the ...
Traveler's user avatar
  • 17k
1 vote

Why is my lawn sprinkler backflow preventer failing?

It sounds like you have a blockage in that zone and the water is dispersed through the backflow. Try taking the heads off at the beginning of the zone. Also look for damp ground where a brake may ...
RMDman's user avatar
  • 27k
1 vote
Accepted

Do I need a backflow preventer before my yard hydrant

The catalog and product sheet don't mention backflow, and I assume that's a feature they would want to highlight. The same company also sells backflow prevention devices so its something they know ...
JPhi1618's user avatar
  • 27.8k
1 vote
Accepted

Can I eliminate irrigation vacuum breaker after installing upstream RPZ?

Certainly The NJ Plumbing Code (based on the IAPMO UPC) expressly permits the use of RPZs for protecting irrigation systems in 10.5.10, and I cannot find language in the code that'd prohibit the use ...
ThreePhaseEel's user avatar
1 vote

Backflow preventer spewing water

Your RPZ needs servicing That sort of continuous spitting or streaming from a Reduced Pressure Principle/Zone (RPP or RPZ) assembly with nothing going on downstream is a sign that the assembly needs ...
ThreePhaseEel's user avatar
1 vote

Why is my sprinkler system backflow leaking after being winterized?

Obviously, your main sprinkler shutoff valve in the basement is leaking allowing water to leak into the vacuum breaker and out through the bell cap on the the backflow preventer. You will need to ...
HoneyDo's user avatar
  • 8,754
1 vote

Why is my sprinkler system backflow leaking after being winterized?

Your main shut-off is leaking ( not shown ) into the system. Until it completely stops water flow ,leave the red hose bibb open to prevent water from going into the rest of the sprinkler system. I ...
blacksmith37's user avatar
  • 8,291
1 vote

I know there is a pressure vacuum breaker here, but what is the rest?

In my area, it is common for PVB to break if incorrectly winterized, but local water code requires these to be installed and inspected annually, with an inspection report filed with the city water ...
Fredric Shope's user avatar
1 vote

Is a back flow valve needed to attach a washing machine?

One way to accomplish this is; You can add one Inline spring check valve to each supply line. After the check valves you can tee the hot and cold together with one 1/2" copper pipe out into a 1/4 ...
Alaska Man's user avatar
  • 13.5k
1 vote
Accepted

How to connect to black underground sprinker pipe

The black sprinkler pipe is probably HDPE and not PVC so you need a different connection method than with PVC. Your best bet is to check with a local sprinkler supply company that can give you the ...
jwh20's user avatar
  • 23.2k
1 vote

Is my irrigation system winterized properly?

The ONLY way to ensure that there is no water trapped in low spots in a sprinkler system is to BLOW it out with compressed air. Until that is done, there is almost certainly some amount of water ...
jwh20's user avatar
  • 23.2k
1 vote

Can this water valve be replaced as a separate component?

That's just a basic quarter-turn ball valve that's been tossed in there for shutoff purposes The cracked part isn't part of the backflow preventer proper; it's simply a quarter-turn ball valve that's ...
ThreePhaseEel's user avatar
1 vote

How to prevent the washing machine outlet from backflowing to other devices

If these appliances are supposed to drain into a standpipe, then they need to be connected in a way that allows them to drain in open air. Get a double wye, of the appropriate size to fit on the ...
Tester101's user avatar
  • 131k
1 vote

Why did my febco backflow preventer fail?

The only way that could happen is if the nut was loose and then pressurized. Those BFPs are serviceable and the nut must have been left loose. If you can find the components from under the bell you ...
Joe Fala's user avatar
  • 6,334
1 vote

Sprinkler System Low Pressure

The size and configuration of the entire piping system that supplies your irrigation setup, from point of entry to your property (usually the water meter) all the way to each sprinkler head, along ...
Jimmy Fix-it's user avatar
  • 35.3k

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