Mueller Backflow Preventer Vacuum Breaker - Check Valve - 2 Pack

exactly what I was looking for. works as it should.

Mueller Backflow preventer vacuum breaker works flawlessly and is a good value for the money

Thank you! Arrived quickly, good deal and great sturdy valve!

The product was exactly as described.

perfect fit and delivery on time, good price.

High-quality. Just what I needed for my outdoor faucets.

Works well for gardening use

A quick test filling a 2.5 gallon container without the Backflow Preventer took 40 seconds. With the Preventer took a minute. Your mileage may vary. It was not practical for me to use to fill a 300 gallon pesticide spray tank as I intended, so I don't use it. In critical applications where you have to have one it may be fine product.

The product itself is great. That's why 3 stars. It's made well and Bic shipped free. However, our outdoor faucet has fine threads and apparently has to have a $24 adapter not sold by Walmart. Bic offered to refund the purchase but I felt that the shipping cost would make the refund worthless. They gave a partial refund which was very nice but not really necessary. Small items like this sometimes come in handy. I think the fault lies with Walmart because their photo didn't really show the threads clearly. At least not on my system. I recommend this item with reservations. If anyone has fine threads on their outdoor faucet, this will not work.

Odd experience. Although the backflow preventer is really very well made, all it did was block the flow of water through my sprinkler system while attached at the hose inlet. When I removed it, the water immediately flowed properly. But while on, barely a trickle.