Member's of the USC Foundation enjoy exclusive access to the List of Previously Approved Backflow Prevention Assemblies. The list consists of backflow prevention assemblies that have been approved by the USC Foundation in the past but were removed from the current USC List.  The original approval date is shown along with the date the approval was rescinded and the reason.  Additionally, the edition of the manual under which the assembly was approved is also listed.

The List of Previously Approved Backflow Prevention Assemblies is available to members as a digital download and only from the USC Foundation's Online store. For more information about accessing the List please see the instructions to the right of this screen.

Please consider joining the USC Foundation Membership Program to gain access to the List of Previously Approved Backflow Prevention Assemblies. In addition to accessing the previously approved list, members also receive substantial discounts on training events and products, free access to the Webinars on Demand library, receive notifications every time the USC List is updated and and much more!