- Aquacosm
 - Provides information on plumbing contractors, water well drillers, pump installers, septic and irrigation contractors, and water treatment firms. - BathWeb
- Dedicated to bathroom manufacturers and dealers, bathroom designers and remodelers, bathroom design software and bathroom specialists.
- Plumbing-info.com
- Offers directory and resources for the plumbing, sanitaryware, and related industries.
- Plumbing.Net
- Lists American manufacturers of plumbing supplies.
- PlumbingLinks.com
- Includes links to associations, contractors, distributors, publications, and resources.
- PlumbingPages.com
- Lists manufacturers, stockists, and plumbers, and offers other information for consumers and the plumbing industry.
- PlumbingWeb
- Links to resources, associations, contractors, manufacturers representatives, manufacturers, and wholesalers.
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