Backflow vs low flow hose?

[Sunny]

Our plumber added a new hose faucet for us and it has a backflow prevention device on it which is fine, but we seem to have to turn the water on high to keep the water from flowing out of the device... if I want to have a hose just watering slowly is there a way to fix this?
Thanks -

[Cass]

Call the plumber back. He can replace the part that is leaking and stop the problem.

[hj]

It is defective if new, and worn out if it is the old one.

[Sunny]

Thanks to both. I was afraid it was maybe just "supposed to" be that way, in the way that lots of newer things seem to be disappointing in some way. This is a relief, I'll call the plumber.