The DeringerTM 20 Double Check Valve Assembly is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage conditions

Features
• Intergral shutoff valves indoor/outdoor application
• 100% stainless steel housing
• Tamper-resistant test cocks
• Patented Dual-actionTM check modules
- Poppet action at low flow
- Swing action at high flow
• Silicone elastomer check discs
• Prewired supervisory switches
• Flange adapters available
• IPS grooved ends