The Bonnet Repair Kit is compatible with the 1/2" - 1" Model 720 Pressure Vacuum Breaker. Repair Kit components conveniently include three Canopy Screws, one Canopy, one Bonnet, one Bonnet Washer and one Bonnet O-Ring. Watch the Zurn YouTube channel for videos and helpful step-by-step instructions for how to repair the Model 720 Pressure Vacuum Breaker. Repair Kits are sold as accessories for quick and simple repair needs, providing long-lasting protection from back siphonage of contaminated water into the potable water supply in non-potable, residential and commercial irrigation applications.