GasBreaker a Division of Hubbell Gas Connectors and Accessories (HGCA) offers a "Family of Excess Flow Valves" that meets most residential, multiple meter and commercial gas service line applications.Since 1974, UMAC Excess Flow Valves (EFVs) have set the standard with millions installed worldwide. UMAC EFVs are used today in service line applications ranging from 5 PSI to 1000 PSI. GasBreaker low pressure EFVs are available for in house piping applications up to 5 psi.