Hunter Sprinkler HC50F50M HCV 1/2-Inch Female Inlet by 1/2-Inch Male Outlet Check Valve

I installed this just beneath my lowest sprinkler and, at first, the leak remained just as bad. So I took the sprinkler and check valve out, and flushed the line. With the line clear of dirt, I rinsed out the inside of the check valve (it turned out there was indeed dirt preventing the valve from closing) then reinstalled it, being mindful not to introduce any new mud into the line. It works perfectly now. It no longer leaks after the water is shut off. Good product, just be careful to flush your irrigation line beforehand.

It fix my head sprinkler leaking. If you have a head sprinkler keep leaking you need to buy this one.

I had two sprinkler heads at the bottom of a hill. The heads had check valves built into them however the slope of the hill was so great that they still leaked badly. So much that my pump would not hold its prime. Had two different irrigation companies look at why my pump wouldn’t hold prime and after over $800.00 of them repairing my system without even considering the leaking heads at the bottom of the hill, my system still wouldn’t hold prime. They wanted to dig up the well as they assured me that was the problem, I told them to just leave. I purchased these check valves and put one under each of the leaking sprinkler heads. Each one only took me about 10 minutes to install. The heads no longer leak at all and the system holds prime even if I have it shut down for weeks. Wish I would have tried these before I called in the so called professionals. These fixed the problem and the entire system now works as designed.

This check valve works well for the sprinkler system. it is easy to install for a diy'r. It might have taken me a couple of minutes to install. I did try to use and extra one i had at a friends place, it didnt work well on hit extremely steep hill, there was to much water pressure for it.

These check valves can be used to artificially increase the elevation of a sprinkler, and/or to prevent drainage from the lowest sprinkler in a zone. However, I'd highly recommend first flushing the zone (using risers or additional funny pipe as needed to avoid backflow), then using Blue Monster's PTFE tape to form a waterproof seal on both ends of the check valve (with the funny-pipe connector and with the sprinkler). Additionally, if you have other leaks in your zone, you may find a need for multiple check valves adjusted to lower elevations after you've added one check valve to the lowest sprinkler, so avoid applying PTFE tape until you're satisfied that all leaks are resolved.The check-valve adjustment wheel is fairly difficult to turn as a plastic bump is in the middle. I needed to place a medium-sized screwdriver's flat head at an angle to make the wheel turn, and it's hard to see what you're doing, so good lighting is important.

wasn't sure this would work, but it worked perfectly. Before a 1/2 hr steady drain out of the head (10' below other heads), but after install, not a drop of water came out when the zone shut off. Really happy.

Did not work on my sprinklers

Very easy installation and adjustment. Not sure if it is adjusted the way it stated in the specs initially, but an easy adjustment fixes that in seconds.