Second Check Assembly Repair Kit for 8" and 10" 375DA/475DA/450DA and 10" 350ADA
Manufacturer: Wilkins
Size: 8 Inch, 10 Inch
Product model: 375DA, 450DA
Size: 8 Inch, 10 Inch
Product model: 375DA, 450DA
Installation and Maintenance Instructions 8" - 10" Specification Sheet Specification Sheet for Valve Setters Repair Parts Guide 
Zurn Wilkins Backflow Prevention Detector Assemblies - How it Works
Zurn Wilkins Backflow Prevention Model 49 Butterfly Valve - How to Adjust Opening and Closing Stop
Zurn Wilkins Backflow Prevention - Why does Zurn call it a Compound Check?