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Wilkins 720A PVB Backflow Preventer 1" FPT | WK720A-100

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Sale Price $78.79
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Wilkins 720A 1" in. PVB Backflow Preventer

  • Wilkins 720A (WK720A-100) Backflow Preventer
  • Female Pipe Thread
  • 1 inch

The Zurn Wilkins 720A Pressure Vacuum Breaker Assembly is used in high hazard applications for back siphonage protection. Applications are primarily non-potable residential and commercial irrigation systems. Designed for installation on irrigation water lines to protect against back-siphonage of contaminated water into the potable water supply. Assembly shall provide protection where a potential health hazard exists.

Features & Benefits

  • ASSE Listed 1020
  • IAPMO Listed
  • CSA Certified
  • Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California

Product Details

  • Sizes: 1/2", 3/4", 1", 1 1/4", 1 1/2"


  • Main valve body Cast Bronze ASTM B584
  • Fasteners Stainless Steel, 300 Series
  • Elastomers Silicone (FDA approved), Buna Nitrile (FDA approved)
  • Polymers Polypropylene (FDA approved), Delrin (FDA approved)
  • Springs Stainless Steel, 300 series


Irrigation systems supplied by domestic or private potable water systems are considered to be a potential pollution hazard to the water supply. These systems must include protection to prevent possible backflow of irrigation water into the potable water supply.

Federal law requires a proper backflow device to be installed on any watering system to prevent contamination of the supply; whether it be pump or city water. Check your local water authority for installation requirements & codes. In many rural areas; specific requirements for landscape irrigation systems may not be covered in local plumbing codes and/or enforcement may be limited. HOWEVER...limitation in local authority does not alter the basic requirement for protection of the potable water supply.

Related Articles & Videos



Capacity thru Schedule 40 Pipe
Pipe Size 5 ft/sec. 7.5 ft/sec. 10 ft/sec. 15 ft/sec.
1/8" 1 1 2 3
1.4" 2 2 3 5
3/8" 3 4 6 9
1/2" 5 7 9 14
3/4" 8 12 17 25
1" 13 20 27 40
1 1/4" 23 35 47 70
1 1/2" 32 48 63 95
2" 52 78 105 167
Wilkins 720A PVB Backflow Preventer
Wilkins 720A PVB Backflow Preventer Wilkins 720A PVB Backflow Preventer Wilkins 720A PVB Backflow Preventer Wilkins 720A PVB Backflow Preventer
Product Tag:
Best Value
Backflow Size:
Lead Free:
Not Lead Free
End Connection:
Size (in.):
Lead Free:
Not Lead Free
Max Working Pressure:
150 PSI
Temperature Range:
32F to 110F
Pressure Vacuum Breaker (PVB)
1 Year
Test Cocks:
Stainless Steel
Hydrostatic Test Pressure:
300 PSI
Main Valve Body Materials:
4.7 / 5.0
24 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Sprinkler Warehouse comes through again with quality parts and quick delivery. Thanks
July 10, 2018
1 year ago
Exactly as described
Arrived brand new, unopened, looks and operates exactly as described and pictured in all accompanying photos. Saved me over $40 from local HD prices.
May 14, 2018
1 year ago
perfect identical replacement.. The valves were stuck because of storage time, but nothing a small wrench couldnt handle.. operated with ease after the valves broke loose...
August 19, 2019
5 months ago
Wilkins 720A backflow preventer
Great product and easy to install.
June 13, 2014
Love this backflow. Very easy to install.
August 28, 2014
Product came in as expected
I received the product I needed and was able to use it to fix my sprinkler system
April 26, 2014
This is the one
This product was simple to install and is a great value.
June 17, 2015
I was skeptical at first because the prices were so good, but after installing and using all the products I purchased I was glad I decided to try it out.
February 16, 2016
Back flow worked fine. It installed perfectly and is in operation. Good product
May 31, 2018
1 year ago
Good unit
Perfect replacement and no issues with craftsmanship
April 22, 2018
1 year ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 40 questions Browse 40 questions and 127 answers
Why did you choose this?
SprinklerWarehouse.com Store
Most common one I use.
Jeremy B on Nov 19, 2018
I need it
G A on Aug 11, 2018
Most common one I use.
Jeremy B on Nov 19, 2018
kevin k on Oct 6, 2018
I need it
G A on Aug 11, 2018
Same as I have that was installed 09/1995.
Gary S on Jul 20, 2018
I need it
J O on Jul 1, 2018
Recommended by professional installer
J P on Jun 16, 2018
Because mine is broken!!!!
Michael K on May 29, 2018
Robert S on May 14, 2018
its the same one that broke.
T B on May 7, 2018
price and quickness of product delivery
R L on Apr 25, 2018
current back flow valve leaking
A S on Apr 9, 2018
Last one failed - froze.
T S on Apr 7, 2018
This is replacing my old one.
C A on Apr 6, 2018
I chose this item as a direct replacement for a freeze damaged item.
A G on Apr 5, 2018
To replace my existing one. Its the same brand and size
M U on Mar 29, 2018
Because it is what is installed. I am just replacing it.
J A on Mar 29, 2018
Broken due to freeze
Tennis Junkie on Mar 12, 2018
Because I broke mine
C J on Mar 10, 2018
have used them in the past with good results, familiarity
Rick H on Feb 27, 2018
Broken during cold weather. Valve cracked.
TNMMKN on Jan 22, 2018
Replace in kind parts that burst from freeze
E D on Jan 8, 2018
nearest fit for my requirement.
G E on Jul 27, 2017
replace old unit
V C on Jul 21, 2017
I used it before and it worked perfectly. The service was great and shipping was also quite efficient.
Catherine N on May 5, 2017
Replaced a leaking Preventer
Raymond B on Apr 27, 2017
The 720A can be easily damaged beyond repair after a frost. The Febco is much more repairable because all damaged parts are replaceable plastic, no damaged brass.
Doug S on Apr 26, 2017
wilkins is the standard in my area and is quick and easy to repair.
Paul on Apr 7, 2017
M T on Mar 26, 2017
price compared to competitors
T J on Mar 25, 2017
Because it is will keep our potable water safe.
T H on Feb 17, 2017
the old one broke due to freezing
Tennis Junkie on Feb 7, 2017
Replacement for my old one
Raz Bike on Jan 17, 2017
Freeze damage
Bob A on Jan 13, 2017
Best durable PVB backflow in the industry
Byron V on Nov 24, 2016
To ensure no outdoor irrigation water could return into the household water supply. Would buy again!!
John Z on Sep 19, 2012
This is a quality backflow preventer that holds up and is easy to install.
Mike Y on Apr 27, 2012
kevin k on Oct 6, 2018
Same as I have that was installed 09/1995.
Gary S on Jul 20, 2018
I cann't find the size of the 720a. I looked at the plate,and try to find the size on the arms. any suggestions?
A shopper on Jul 7, 2012
BEST ANSWER: i cant find the size of the 720ai looked on the plate and ty to find the size on the arms and top of cap any suggestion?
I have water dripping out from the too black cap, is that a problem and is it costing me money on my water bill?
A shopper on Nov 5, 2014
Do you sell the 1" 720A that points to the right?
Joe B on May 17, 2015
Is it completely functional unit with all the interior parts incluede?
ron c on Jun 14, 2014

An interior part of my original 720A was damaged (cracked) in the freeze. I took all the interior parts from the new one and installed them into the old body of the old one and it works fine.
where does the bottom piece hook to? does it hook to the pipe, hose coming out of the ground?
A shopper on Jun 24, 2013
BEST ANSWER: The piece on the side will connect to the water suppy and the peice on the bottom will feed the sprinkler system.
this valve looks like has a left handed outlet line. Do you have one with right handed outlet line?
Miah B on Jul 30, 2016
BEST ANSWER: If you're asking if this has left handed thread, no. Everything is right-handed threaded. The best way to put these units on is intact, assembled that is. I have always had to cut the PVC side of the assembly, And then weld that part together after it is threaded into the backflow preventer.
I only need to black top cap that screws on top of the valve. Is it possible to purchase it separately?
A shopper on Apr 4, 2014
BEST ANSWER: Never tried to order just the weather cap... I have stripped several off of backflows that I took out that of service. Contact a local Backflow Tester and see if he/she will sell you one. I would send you one but can't seem to give my e-mail address at this site.
Does the Backflow Preventer come with the valves as shown in the picture?
A shopper on Jul 15, 2013
BEST ANSWER: The Backflow preventer comes exactly as shown in the picture. I would advise you to tighten down the valves as much as possilbe to make sure it is very tight to prevent any possible leaks. If that happens you would have to undo everything and start again from scratch.
Which is better, Febco versus Wilkins?
A shopper on May 22, 2013
BEST ANSWER: Not sure about Febco...But, I have gotten great service from the Wilkins. Easy to install...Easy to drain (for winter...if applicable). No problems.
What is its body made of?
A shopper on May 16, 2015
BEST ANSWER: bronze bonnet and stainless ball valves
I must replace a busted wilkins 720a pressure vacuum breaker assembly. How do I determine if I need the 1 inch or 3/4 inch assembly?
Nicholas A on Apr 10, 2015
BEST ANSWER: When I replaced mind because of Freeze Damage, I replaced it with the size I had already.

If in doubt, go with the 1". You can always bush it down to 3/4" if you have to.
when i turn my system does this value need to be open or closed?
jim g on May 9, 2014
BEST ANSWER: When you turn your sprinkler system for the first time in the spring, both valves should be open. There are alos two little valves that you can turn with a flathead screwdriver that may or may not be open, depdending on who wintereized your system. These should also be closed.

This is the process that I use, and have used for the last 13 years of working on and installing sprinkler sytems, for startup in the spring.

1. make sure large valves on back flow are open, small ones closed.
2. turn on sprinkler timer/controller so that one zone is on
3. Slowly turn on the water supply valve that supplies the sprinkler system until completely open.
4. go through each zone to make sure valves are working, make adjustments, and check for leaks.

Water will flow out of the top of the backflow preventer untill the pressure equalizes in the system and then it should stop. This is normal when starting up the system.
Two questions; 1st how difficult is the installations?
Second, the backflow preventer crack due to weather.
What covering is best use during the winter.
A shopper on May 9, 2013
BEST ANSWER: 1st question: it was an easy install for me, and I'm no plumber. As long as it is roughly the same dimensions as your old backflow preventer you should be good to go.

2nd question: I've had similar problems. After blowing out the system in the fall... close off both sides of the valve and shut off the water from the house to the backflow preventer. If there is a rupture then at least it will be in cheap (relatively) copper pipe instead of this item. If you have any petcock (sp?) drains open them - they look like giant wrist-watch-winders. They allow the pipes to drain if any of the valves have a leak (our valves all leak a little).
we have Wilkins 720 A which is leaking(steady drip) under the top. I don't see any gasket/oring, etc. what could cause/how to stop, the leak? It is about 3years old-installed when house built. Thank you
Kenneth M on Nov 21, 2012
BEST ANSWER: There is indeed an o-ring you can replace. Get the instruction sheet from Wilkins, (805) 238-7100. The plastic top comes off with three screws exposing the valve and seat, disk and poppet assembly. The valve moves to the closed position when high pressure is applied from the water supply. I had one freeze (very cold temps near zero for days) and that caused the block to crack and leak severely in the spring (wherein I was required to replace the back flow preventer). A mild freeze could simply "warp" the valve seat. Hopefully you simply have a leaking seal. Best bet: turn off the water supply, remove the plastic top, and look inside for the moving valve part (disk and poppet assembly). There is a replaceable o-ring. I'm betting this will fix your problem. Good luck!
Had a freeze last night and the cap to our Wilkins 720a cracked and is leaking.
It looks like the main mechanism is okay.
Can you buy just the plastic cap?
Terry J on Jan 14, 2013
BEST ANSWER: Sorry to hear about your misfortune. I do not believe you can purchase the top cover. Maybe try an auction site but this is an uncommon issue. I had a blow out due to my improper winterization myself and had to purchase a new one. But I kept the old one to salvage parts if needed. Sorry I could not help further.

Good Luck
can i turn down the preasure ?
A shopper on Jul 11, 2012
BEST ANSWER: The only thing you will be able to do with the pvb is slightly close one or both ball valves which will constrict the water flow through the pvb into your mainline. Therefore restricting volume not pressure. You can use pressure regulators at your haeds to control your pressure.
I have a Wilkins 420 1" PVB and the brass body is cracked due to a freeze in Houston. Does the Wilkins 720A-100 1" replace the Wilkins 420 1" PVB? Would it be difficult to install for a person who has absolutely no plumbing experience? What additional tools and supplies will I need to install this assembly?
Mervin W on Mar 21, 2011
BEST ANSWER: Merivn......I have to say up front that I don't know if the two different assemblies are just alike, but I am fairly sure that they function the same. The main issue would be the size of the pipe involved. Just know that the flow goes from the down leg to the leg that is at right angles, towards the sprinkler. The unit comes with instructions for use, and they are easy. As far as connecting the unit up, you'll need the part of the pipe that screws into both sides. All things being equal, you can just cut the pipe off of the old unit, leaving about 2 inches of good pipe attached to the threaded ends. Take them out of the old unit, put some teflon tape around them, and screw them into the new one.
Now, making sure that you have enough 1" couplers, and some extra 1" PVC pipe, use a hack saw, or PVC pipe cutter tool to re connect the unit to the old pipes. Be sure to use some sand paper to clean up the inside of the couplers, and the OD of the PVC pipe....Put plenty of PVC pipe cement on both the OD of the pipe, and ID of the couplers. Start with the supply side pipe. Put the first coupler there, then the next length of pipe into that, then the next part, either another coupler if you are extending the length, or, the piece that you have screwed into the unit. Now that that is set, make sure that you have aimed the unit right at where the other PVC supplied line is, and start from the unit with a coupler, Pipe, and connecting coupler. Be sure that you give all of these joints a slight twist as you are seating them. This will make sure that there are no incomplete applications of glue. Also, you will do better if you do a trial fit of all of the patch fittings before you do any gluing. Good Luck.
all I need is the cap,any solution for that part?
A shopper on Apr 26, 2018
BEST ANSWER: If you are referring to the canopy, Furguson plumbing has them. This site will not let me give you the link, but easy to find Ferguson plumbing
Is there any loss of pressure using Wilkins 720?
Charlie on Jul 29, 2016
BEST ANSWER: All Backflows have some pressure loss, depends on the spring pressure. The 720A is minimal loss maybe 1-3 lbs.
How do I replace the cracked bonnet?
A shopper on Jun 27, 2016
BEST ANSWER: Replace the whole unit. Also if it was caused by freezing be sure to remove unit before winter . It is very difficult to keep them from cracking.
who makes an indoor pressure vacuum breaker ?
A shopper on May 3, 2016
BEST ANSWER: there is no indoor PVB. The only thing you can do is install a RPZ and pipe the drain outside or to a inside drain
Do you have the 720A-075 3/4" model?
Tom E on May 7, 2015
BEST ANSWER: are you asking me or sprinkler warehouse? I ordered the wrong size and just used some pvc adapters for my 3/4" system.
Dave asks: Does the 720A/ 1" valve have a frost prevention component ?
Dave A on Mar 8, 2012
BEST ANSWER: No - and it's important to drain the little valves in addition to the primaries - the little valves are the ones with the slot heads. If you don't the preventer will freeze and burst.
I have an old Wilkens Pressure Breaker, the model I have are as follows. 720A, 1020, 110F. There's also on the same side 2 1/8 openings. It's also copper, do you guys have this?
jeff b on Aug 12, 2016
BEST ANSWER: I installed this one. They are brass. What's wrong???
how much is shipping and from WHERE?
A shopper on May 8, 2018
we have an existing wilkin 720 A PVB. I am trying to find size to order. Top of the canopy has two numbers. 1020 and B6412. Body has a number T036454. How do I identify size? Is it 1", & 1 1/4"?
Kirti S on Mar 7, 2018
Is pub model 720A available now?
A shopper on Jun 13, 2017
How do you know what size you currently have?
A shopper on May 30, 2017
How do you tell what size valve - 1" , 3/4", etc?
s w on May 24, 2016
how long will shipping take to nj
landscaper coming next thursday 11/5 ?
Al W on Oct 29, 2015

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