Check out the unauthorized unapproved by USC, not a Febco repair part!
This is a Great way to void any possible warranty from the factory. Yes, your backflow device failed. Yes, you need to repair it. Yes, you need to use original factory parts from the manufacture. The Backflow device is supposed to be inspected by a licensed backflow Inspector/Tester after all repairs to insure the device is operating correctly. Its purpose is to protect your water supply and your neighbors water supply. Why risk your water quality with less than original factory repair parts.