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Posted by HeatPro on September 06, 2008 at 10:59:43:
In Reply to: new boiler, backflow valve posted by josie on September 05, 2008 at 23:46:01:
Expensive, but easy to replace. Not so easy to fix as it should be verified after repair.
http://www.asse-plumbing.org/Articles/Backflow/Testing%20a%20Reduced%20Pressure%20Principle%20Backflow%20Preventer.pdf
http://www.icgov.org/default/?id=1716
http://www.hbws.org/cssweb/display.cfm?sid=1162