5 Biggest Plumbing Supply Companies in the World

4. Centrica plc (OTCMKTS:CPYYY)

Latest 12 Month Revenue Estimate: $27 billion (1GBP = 1.20USD)

Centrica plc (OTCMKTS:CPYYY) is a British firm based in Windsor, the United Kingdom. It is one of the oldest companies on our list since it was set up in 1812. The firm provides smart home products including radiator valves, sensors, leak sensors, and boiler monitoring products.