4 Pack Brass 3/4" Inch GHT Hose Bibb Connector Backflow Preventer Vacuum Breaker

They work, good value, and seem well made

Overall good. I have used a few different brands and they are all similar. These were the best value and comparable to the others. I did have one of the set screws break off when backing it out, it needs to be drilled out, but I never had this happen before.. I think it must have been cross threaded some how. Nevertheless, good deal, easy to install and I would purchase them again.

Don't know how to test backflow prevention. However, I didn't fully read the product description and was rewarded with wet pant legs! It spits water at you after you shut off water!!!! Haha! Good thing current temp was around 100. Might not be so fun in the winter. Now I gotta figure out shutting off water from several feet away. Hmmm....

Great value. Solid brass. Extra washers and plumbers tape -no trips back to the garage. No leaks! No splash back.Surpass two other suppliers on Amazon.QUALITY !

Worked as expected

Great product

I wanted something to stop water from being sucked back into, and contaminating, the supply without having to replace the water valve. After placing these on all the valves there is no water running back into the house!A honestly I'm extremely supposed with how sturdy and we'll these work it's been a couple of months using these and there is no sign of failure! Definitely an awesome buy and a great product!

Couldn’t be easier to use