The Plumber dot com
Information on plumbing. Includes the history of plumbing.
PLBG dot com
Plumbing discussion board.
Plumbing Store dot com
Retailer of plumbing supplies
Plumbing Net
Directory of Plumbing Manufacturers
American Society of Plumbing Engineers
American Society of Plumbing Engineers
Plumbing Supply
Retailer of plumbing supplies
Plumbing Web
Information on plumbing.
Plumbing Heating Cooling Contractors Association
Plumbing Heating Cooling Contractors Association