How to repair the FEBCO 765-1 pressure vacuum breaker valve used in irrigation systems.

Valves known as vacuum pressure breakers, anti-siphon, and backflow preventers are used to stop the flow of contaminants from irrigation systems back into the clean water supply. It is important to protect the valves from freezing in harsh winter conditions. This video covers how to repair valves damaged from freezing conditions. In this video the FEBCO 765-1 model valve is used, but other makers like Zurn Williams, or Wilkens will use similar repair techniques.
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Parts and replacement valves for FEBCO 1 and 1 ¼”:
Febco OEM Bonnet Poppet Assembly Repair Kit 765 for 1” and 1 ¼” Backflow Preventer Valves: amzn.to/3WoP2Fa
Generic Part- Bonnet Poppet Repair kit fit for FEBCO 765-1 Replacement Part# 1-1/4" Backflow Preventer & 905-212 1" and Vacuum Breaker Part 905212 for FEBCO 765 1" & 1 1/4" Vacuum Valve: amzn.to/3WEyLvM
Febco 765-1" BV-Pressure Vacuum Assembly (Complete valve replacement): amzn.to/3WeQ06Z
Check Valve Assembly Repair Kit, Fit for Febco Model 1"-1-1/4": amzn.to/3FVnWhY
Parts and replacement valves for FEBCO ¾”:
Febco 765 1/2" - 3/4" Bonnet Assembly: amzn.to/3BYdqFD
FEBCO 765 3/4' PRESSURE VACUUM BREAKER COMPLETE DEVICE: amzn.to/3juJOZV