My mother had a sprinkler system installed about 5 years ago and always had it blown out by the company that installed it. This year she asked if I could do it for her instead of paying the $65 they charge. I won't even get into the buried in dirt zone valves and non-sealed wire nuts...
I hooked my compressor up to the test port on the outlet side of the backflow preventer and as soon as I turned on the air it began leaking out of the top of the Watts 800M4FR. My 2 year old Wilkins doesn't do this.
Am I looking at a defective backflow preventer here? Water doesn't leak while under pressure from the water supply but I suspect the backflow prevention is non-existent now. I'm also not sure which repair kit to buy on the website for this model if someone could point me in that direction.
Thanks