Zurn Wilkins RK1-720A 720A Pressure Vacuum Breaker Repair Kit compatible with the 1/2”, 3/4”, and 1”

I came home to a leaking pressure vacuum breaker. Water was leaking out of the top, and after looking the entire breaker over to make sure it wasn't cracked I ordered this kit to repair the leak. It took about five minutes to repair the leak once the kit arrived. Instructions are clear and easy to follow. As long as the breaker housing isn't cracked, I recommend trying one of these before replacing the entire breaker.

My valve started leaking a year ago and I assumed I would have to replace the entire installation. I ended up finding this repair kit on Amazon almost by mistake while searching for the model number of my backflow preventer (Wilkins 720-A).Lots of good tips in these comments about installation and I'll try and capture them here for anyone reading this:1. I did not use the lubricating jelly at all... I have no idea what it was suppose to go on, but my valve works fine so that's good.2. After you take your plastic cap off, you might do what I did and stare at the valve and think: "This looks like a solid brass housing... how the hell do I get IN there?" - the brass top you are staring with the 3 screw pillars that the plastic top sits on... actually UNSCREWS out of the top of the valve housing. A super easy way to do it (that I got from these comments) is to take the screw driver you just used to remove those 3 top screws, law it sideways/between/across 2 of the pillars and use that leverage to unscrew that top. It comes right out.3. The O-ring you need to replace is potentially smashed down into the channel around the inner lip of the brass housing right after you remove the top from Step #2... if you just removed the top, look around the inner lip of that brass housing, right under the threaded outside rim... you'll see it. You might need to dig it out with a little metal pick or something - mine was smashed into place and I had to dig at it before I tore part of it out then I could pull the rest out easy.4. The spring was the only thing that gave me pause for a minute. It goes down into the valve, small/tapered side first and the big/open side actually pops down inside the top lip of the housing. To get it out, you basically need to contract the open end a bit so it clears that top lip then you can pull it out. I found the end of the sprint under the top lip, used a screw driver to sort of pop it out from under that lip and start to drag it out the top of the housing and as soon as I got a few inches of it past that little lip, POP, the rest of it came right out, no problem. Putting the new one in was basically... "just smash it all down through the hole past that lip and once it was in there, use the screw driver to straight out any coil overlap so the spring sat naturally".Hope that helps!

Just installed this repair kit today to see if it would solve a chattering issue with my vacuum breaker valve. Well the install was great and I saw a small tear in my old spider disk. Well the difference is dramatic. Every one of my 11 zones runs as smooth as silk. Worth every penny.

It works perfect

All I really needed was the white plastic doughnut shaped piece and the o-ring. It was easier to just buy this kit than go to home dippy and try to buy just a couple parts. I used all the parts anyway because I'll probably forget where I put them years from now if I ever need them. I think it's overpriced for what you get, but obviously way cheaper than paying someone to do it. The rebuild is really easy just be careful when prying out the old o-ring. If you gouge the brass housing, the o-ring will never seat correctly and it will leak.

When the sprinkler water regulator started to leak, I chose the repair route as opposed to the replacement one. It was the correct choice. Savings approximately $225. The instructions are available on line.

This review is only about shipping and fit. Shipping was super fast and the fit was perfect. We will see how durable and long this lasts. It is a manufacture part so I expect it to work/last.

I had a valve malfunctioning and leaking from the top cover area, I found a video explaining the function of the valve and possible problems. I took it apart and found a torn diaphragm. I found this kit to replace all the wear items inside the valve. I saved over $100!