Home Improvements, Building Contractors-Commercial & Industrial, Home Repair & Maintenance, Plumbers, Plumbing Contractors-Commercial & Industrial, Water Heater Repair, Water Heaters. Plumbers are experts in all things related to plumbing. They are an integral part of the US service industry as their role is indispensable in both residential & commercial markets. Plumbers provide various services including back-flow prevention, blocked drain repairs, toilet & tap repairs and more.