Aid valve piston , Aid valve piston o-ring, RV diaphragm, RV stem, RV disc, Aid valve disc retainer, RV seat, RV seat o-ring.
You’ll want to take a look at climate your backflow assembly is a RPZ, or a RPZII. There’s a other equipment for every. The imprints will have to be at the unit itself.
Aid valve equipment for a Flomatic RPZ Backflow Preventer
irrigation backflow refief valve assembly