|Posted by Dales Plumbing Service on December 31, 1999 at 07:20:47:|
|In response to Re: Back flow preventer|
: I have an underground lawn sprinkling system in New York City. Does it need a dual-valve back flow preventer, or is a vacuum-relief valve adequate?
Walter, It needs a double check on your sprinkler. Install a blow off for draining the system with air pressure in the fall. Dale Peck LMP