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Fire Sprinklers - Double Check Valve

A Double Check Valve (otherwise known as a Backflow Preventer) is used to stop stale water from a fire sprinkler system flowing back into the potable water system.

I need one with a diameter of 1.25" (or greater, up to 2").  If there is not much price difference then getting a 2" one is best.

Double Check Valve Zurn 2" 

 

http://www.pexuniverse.com/wilkins-2-950xlt2         2"        $355.95 + $0

http://www.pexuniverse.com/wilkins-114-950xlt2     1.25"    $279.95 + $0

 

My existing 1" one is from Ames, but here is the 2" version...
http://www.amesfirewater.com/Products/LF2000B

 

List of suitable approved products...
http://www.ashevillenc.gov/Portals/0/city-documents/water/ApprovedBackflowAssemblyList.pdf