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23 Nov 2001 at 7:59 pm
#291870
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The references can get you started in understanding the plumbing trades:
http://www.epa.gov/safewater/crossconnection.html
http://www.healthyarkansas.com/eng/xconn.htm
http://www.codecheck.com/plumbing_links.htm
http://www.cybercom.net/~jmhi/just28.html
http://www.idph.state.il.us/envhealth/factsheets/hydrogensulfide.htm
http://www.maintenanceresources.com/Bookstore/PipingPlumbing/NatPlumbingCodes.htm
http://www.fpd.ohio-state.edu/bds/div15161.pdf