Re: Back flow preventer
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

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